Ramamurti, G. V. 1933. "English-Sora Dictionary." Madras.

Rákos, Attila. 2002. "Written Oirat." 418: München: Lincom.

Raja Ram, M. G. 1960. "My Contact with the Shom-Pens of Dogmar River -- Great Nicobar (February 1960)." In Bulletin of the anthropological survey of India, 9: 74-80.

Rai, Novel Kishore. A Descriptive Study of Bantawa. PhD thesis, Poona University, 1985.

Radhakrishnan, R. A Preliminary Descriptive Analysis of Nancowry. PhD thesis, University of Chicago, 1970.

Press, Ian. 1986. "A Grammar of Modern Breton." 2: Mouton de Gruyter.

Prasad, Bal Ram. 1991. "Mising Grammar." 17: Mysore: Central Institute of Indian Languages.

Post, Mark. A Grammar of Galo. PhD thesis, LaTrobe University, 2007.

Poppe, N. N. 1930. "Dagurskoe Narechie." Moscow: Akademia Nauk SSSR.

Pokharel, Madhav P. "Strategies of Pronominalization in Kusunda." In Contemporary issues in Nepalese linguistics, edited by Yogendra P. Yadava et al.. 189-192. Kathmandu, Nepal: Linguistic Society of Nepal.