Perekhvalskaya, Elena (2022). "From consonant to tone: Laryngealized and pharyngealized vowels in Udihe". In Hölzl, Andreas; Payne, Thomas E. (eds.). Tungusic languages: past and present. Berlin: Language Science Press. pp. 227–263. ISBN978-3-96110-395-9. OCLC1356978751.