Opgenort, Jean Robert Matheus Leonard. 2002. The Wāmbule Language (xxix + 615 = 644 pp., 39 illus.). Amsterdam: Jean Robert Opgenort. ISBN 90-807158-1-6 – 2002. [The author’s doctoral dissertation, Leiden University, 6 June 2002].
Opgenort, Jean Robert Matheus Leonard. 2004. A Grammar of Wambule. Grammar, Lexicon, Texts and Cultural Survey of a Kiranti Tribe of Eastern Nepal. Brill's Tibetan Studies Library. Languages of the Greater Himalayan Region, 2. Leiden: Koninklijke Brill. ISBN 90-04-13831-5 - 2004.
Opgenort, Jean Robert Matheus Leonard. In press. ‘About Chaurasia’, in Linguistics of the Himalayas and Beyond. Roland Bielmeier, Felix Haller, eds. Berlin: Mouton de Gruyter.
