Bất nhị hay bất nhị nguyên, phi nhị nguyên, phi lưỡng nguyên, không hai (tiếng Anh: nondualism) là một khái niệm mờ, có nguồn gốc từ triết học và tôn giáo Ấn Độ với nhiều định nghĩa,[gc 1] là sự khác biệt với cách nhìn vũ trụ theo lối nhị nguyên. Thuật ngữ có nguồn gốc từ "advaita" (अद्वैत), "không-hai"[1][2] hay "một mà không hai";[2] và advaya,[3] cũng có nghĩa là "không hai," nhưng đề cập đến nhiều tư tưởng Phật giáo như sự thật thông thường và sự thật tối hậu (tục đế và chân đế).[4]
Akizuki, Ryōmin (1990), New Mahāyāna: Buddhism for a Post-modern World, Jain Publishing Company
Amidon, Elias (2012), The Open Path: Recognizing Nondual Awareness, Sentient Publications
Anderson, Allan W. (2009), Self-Transformation and the Oracular: A Practical Handbook for Consulting the I Ching and Tarot, Xlibris CorporationBản mẫu:Self-published inline
Bronkhorst, Johannes (1993), The Two Traditions Of Meditation In Ancient India, Motilal Banarsidass Publ.
Buswell, Robert E. (1991), The "Short-cut" Approach of K'an-hua Meditation: The Evolution of a Practical Subitism in Chinese Ch'an Buddhism. In: Peter N. Gregory (editor) (1991), Sudden and Gradual. Approaches to Enlightenment in Chinese Thought, Delhi: Motilal Banarsidass Publishers Private Limited
Buswell, Robert E (1993), Ch'an Hermeneutics: A Korean View. In: Donald S. Lopez, Jr. (ed.)(1993), Buddhist Hermeneutics, Delhi: Motilal Banarsidass
Cabezón, José Ignacio (2005), “Tsong Kha Pa”, trong Jones, Lindsay (biên tập), MacMillan Encyclopedia of Religion, MacMillan
Caplan, Mariana (2009), Eyes Wide Open: Cultivating Discernment on the Spiritual Path, Sounds True
Carrithers, Michael (1983), The Forest Monks of Sri Lanka
Gombrich, Richard (1996), Theravada Buddhism. A Social History From Ancient Benares to Modern Colombo, Routledge
Gregory, Peter N. (1991), Sudden Enlightenment Followed by Gradual Cultivation: Tsung-mi's Analysis of mind. In: Peter N. Gregory (editor)(1991), Sudden and Gradual. Approaches to Enlightenment in Chinese Thought, Delhi: Motilal Banarsidass Publishers Private Limited
Hanley, Adam W.; Nakamura, Yoshio; Garland, Eric L. (2018), “The Nondual Awareness Dimensional Assessment (NADA): New Tools to Assess Nondual Traits and States of Consciousness Occurring Within and Beyond the Context of Meditation”, Psychological Assessment, 30 (12): 1625–1639, doi:10.1037/pas0000615, PMC6265073, PMID30058824
Harris, Mark W. (2009), The A to Z of Unitarian Universalism, Scarecrow Press
Harvey, Peter (1989), “Consciousness Mysticism in the Discourses of the Buddha”, trong Werner, Karel (biên tập), The Yogi and the Mystic, Curzon Press
Harvey, Peter (1995), An introduction to Buddhism. Teachings, history and practices, Cambridge University Press
Hori, Victor Sogen (2000), Koan and Kensho in the Rinzai Zen Curriculum. In: Steven Heine and Dale S. Wright (eds)(2000): "The Koan. Texts and Contexts in Zen Buddhism, Oxford: Oxford University Press
Isaeva, N.V. (1993), Shankara and Indian Philosophy, SUNY Press
Kalupahana, David J. (1992), The Principles of Buddhist Psychology, Delhi: ri Satguru Publications
Kalupahana, David J. (1994), A History of Buddhist philosophy, Delhi: Motilal Banarsidass Publishers Private Limited
Kalupahana, David (2006), Mulamadhyamakakarika of Nagarjuna, Motilal Banarsidass
Kapleau, Philip (1989), The three pillars of Zen
Karma Lingpa (1989), Self-Liberation through seeing with naked awareness, Station Hill Press
Kasulis, Thomas P. (2003), Ch'an Spirituality. In: Buddhist Spirituality. Later China, Korea, Japan and the Modern World; edited by Takeuchi Yoshinori, Delhi: Motilal Banarsidass
King, Richard (1995), Early Advaita Vedānta and Buddhism: The Mahāyāna Context of the Gauḍapādīya-kārikā, SUNY Press
King, Richard (2002), Orientalism and Religion: Post-Colonial Theory, India and "The Mystic East", Routledge
King, Sally (1991), Buddha Nature, SUNY Press
Kipf, David (1979), The Brahmo Samaj and the shaping of the modern Indian mind, Atlantic Publishers & Distri
Kochumuttom, Thomas A. (1999), A buddhist Doctrine of Experience. A New Translation and Interpretation of the Works of Vasubandhu the Yogacarin, Delhi: Motilal Banarsidass
Kraft, Kenneth (1997), Eloquent Zen: Daitō and Early Japanese Zen, University of Hawaii Press
Larson, G.J. (2014), “Introduction to the Philosophy of Samkhya”, trong Larson, G.J.; Bhattacharya, R.S. (biên tập), The Encyclopedia of Indian Philosophies, Volume 4, Princeton University Press, ISBN978-0691604411
Lavoie, Jeffrey D. (2012), The Theosophical Society: The History of a Spiritualist Movement, Universal-Publishers
Lee, Kwang-Sae (2005), East and West: Fusion of Horizons, Homa & Sekey Books, ISBN1-931907-26-9
Liang-Chieh (1986), The Record of Tung-shan, William F. Powell (translator), Kuroda Institute
Loy, David (1988), Nonduality: A Study in Comparative Philosophy, New Haven, Conn: Yale University Press, ISBN1-57392-359-1
Loy, David (2012), Nonduality: A Study in Comparative Philosophy, Prometheus Books
Lucas, Phillip Charles (2011), “When a Movement Is Not a Movement. Ramana Maharshi and Neo-Advaita in North America”, Nova Religio: The Journal of Alternative and Emergent Religions, 15 (2): 93–114, doi:10.1525/nr.2011.15.2.93, JSTOR10.1525/nr.2011.15.2.93
Maezumi, Hakuyu Taizan; Glassman, Bernie (2007), The Hazy Moon of Enlightenment: Part of the On Zen Practice Series, Wisdom Publications
Mandair, Arvind (tháng 9 năm 2006), “The Politics of Nonduality: Reassessing the Work of Transcendence in Modern Sikh Theology”, Journal of the American Academy of Religion, 74 (3): 646–673, doi:10.1093/jaarel/lfj002, S2CID154558545
Mansukhani, Gobind (1993). Introduction to Sikhism. New Delhi: Hemkunt Press. ISBN9788170101819.
Mohr, Michel (2000), Emerging from Nonduality. Koan Practice in the Rinzai Tradition since Hakuin. In: steven Heine & Dale S. Wright (eds.)(2000), "The Koan. texts and Contexts in Zen Buddhism", Oxford: Oxford University Press
Muller-Ortega, Paul E. (2010), Triadic Heart of Siva: Kaula Tantricism of Abhinavagupta in the Non-Dual Shaivism of Kashmir, Suny press
Mumon, Yamada (2004), Lectures On The Ten Oxherding Pictures, University of Hawaii Press
Murti, T.R.V. (2008), The Central Philosophy of Buddhism: A Study of the Madhyamika System, Taylor & Francis Group
Nakamura, Hajime (2004), A History of Early Vedanta Philosophy. Part Two, Delhi: Motilal Banarsidass Publishers Private Limited
Narasimha Swami (1993), Self Realisation: The Life and Teachings of Sri Ramana Maharshi, Sri Ramanasraman
Nisargadatta (1987), I Am That, Bombay: Chetana
Norbu, Namkhai (1989), “Foreword”, trong Reynolds, John Myrdin (biên tập), Self-liberation through seeing with naked awareness, Station Hill Press, Inc.
Odin, Steve (1982), Process Metaphysics and Hua-Yen Buddhism: A Critical Study of Cumulative Penetration Vs. Interpenetration, SUNY Press, ISBN0-87395-568-4
Rahula, Walpola (2007), What the Buddha Taught , Grove Press
Rājarshi Muni, Swami (2001), Yoga: the ultimate spiritual path. Second edition, illustrated, Llewellyn Worldwide, ISBN1-56718-441-3
Raju, P.T. (1992), The Philosophical Traditions of India, Delhi: Motilal Banarsidass Publishers Private Limited
Rambachan, Anatanand (1994), The Limits of Scripture: Vivekananda's Reinterpretation of the Vedas, University of Hawaii Press
Ray, Reginald (1999), Buddhist Saints in India: A Study in Buddhist Values and Orientations, Oxford University Press
Reat, N. Ross (1998), The Salistamba Sutra, Motilal Banarsidass
Reynolds, John Myrdin (1989), “Appendix I: The views on Dzogchen of W.Y. Evans-Wentz and C.G. Jung”, trong Reynolds, John Myrdin (biên tập), Self-liberation through seeing with naked awareness, Station Hill Press, Inc.
Renard, Gary (2004), The Disappearance of the Universe, Carlsbad, CA, USA: Hay House
Renard, Philip (2010), Non-Dualisme. De directe bevrijdingsweg, Cothen: Uitgeverij Juwelenschip
Roy, Sumita (2003), Aldous Huxley And Indian Thought, Sterling Publishers Pvt. Ltd
Samy, AMA (1998), Waarom kwam Bodhidharma naar het Westen? De ontmoeting van Zen met het Westen, Asoka: Asoka
Schmitt, Charles (1966), “Perennial Philosophy: From Agostino Steuco to Leibniz”, Journal of the History of Ideas, 27 (1): 505–532), doi:10.2307/2708338, JSTOR2708338
Schucman, Helen (1992), A Course In Miracles, Foundation for Inner Peace, ISBN0-9606388-9-X
Seager, Richard Hughes (2012), Buddhism in America, Columbia University Press
Sen Gupta, Anima (1986), The Evolution of the Samkhya School of Thought, New Delhi: South Asia Books, ISBN81-215-0019-2
Sarma, Chandradhar (1996), The Advaita Tradition in Indian Philosophy, Delhi: Motilal Banarsidass
Sekida, Katsuki (1985), Zen Training. Methods and Philosophy, New York, Tokyo: Weatherhill
Sekida (translator), Katsuki (1996), Two Zen Classics. Mumonkan, The Gateless Gate. Hekiganroku, The Blue Cliff Records. Translated with commentaries by Katsuki Sekida, New York / Tokyo: Weatherhill
Shankarananda Swami (2011), Consciousness Is Everything, Palmer Higgs Pty Ltd
Sinari, Ramakant (2000), Advaita and Contemporary Indian Philosophy. In: Chattopadhyana (gen.ed.), "History of Science, Philosophy and Culture in Indian Civilization. Volume II Part 2: Advaita Vedanta", Delhi: Centre for Studies in Civilizations
Slavenburg; Glaudemans (1994), Nag Hammadi Geschriften I, Ankh-Hermes