O ole é unha lingua sino-tibetana falada en Bután.[1]
- van Driem, George (2014). "Trans-Himalayan Arquivado 06 de decembro de 2020 en Wayback Machine.", en Owen-Smith, Thomas; Hill, Nathan W. (eds.), Trans-Himalayan Linguistics: Historical and Descriptive Linguistics of the Himalayan Area, Berlin: de Gruyter, p. 11–40, ISBN 978-3-11-031083-2.
- Gerber, Pascal. 2018. Areal features in Gongduk, Bjokapakha and Black Mountain Mönpa phonology Arquivado 24 de marzo de 2019 en Wayback Machine..
- >Gwendolyn Hyslop. 2016. Worlds of knowledge in Central Bhutan: Documentation of ʼOlekha. Language Documentation & Conservation 10: 77-106.