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.