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DJVU PDF Sprigg, R.K. 1986, "The syllable finals of Tibetan loan words in Lepcha orthography", in Linguistics of the Tibeto-Burman Area, vol. 9, no. 1, pp. 27-46. cite.

DJVU PDF Sprigg, R.K. 1989, "Oral vowels and nasalized vowels in Lepcha (Rong) as the key to a puzzling variation in spelling", in South-east Asian Linguisitics: Essays in Honour of Eugénie J.A. Henderson, ed. J.H.C.S. Davidson, pp. 219-235. School of Oriental and African Studies, University of London. cite.