Kashima, Eri (2020). Language In My Mouth: Linguistic Variation in the Nmbo Speech Community of Southern New Guinea (PhD thesis). Australian National University. doi:10.25911/5e58de79d5e15. hdl:1885/201927.
Kashima, Eri (2021). "The Phonetics of Nmbo (Nɐmbo) with Some Comments on its Phonology (Yam Family; Morehead District)". In Lindsey, Kate L.; Schokkin, Dineke (eds.). Phonetic Fieldwork in Southern New Guinea. Language Documentation & Conservation Special Publication No. 24. Honolulu: University of Hawai'i Press. pp. 53–75. hdl:10125/24994. ISBN978-0-9979673-2-6.