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Turner, John D. (1992), "Gnosticism and Platonism: The Platonizing Sethian texts from Nag Hammadi in their Relation to Later Platonic Literature", dalam Wallis, Richard T.; Bregman, Jay, Neoplatonism and Gnosticism, SUNY Press, ISBN0-7914-1338-1, diarsipkan dari versi asli tanggal 2007-06-22Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)