↑ Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert và đồng nghiệp biên tập (2013). “Hachijo”. Glottolog. Leipzig: Max Planck Institute for Evolutionary Anthropology. Gợi ý |số biên tập viên= (trợ giúp)
↑ Thomas Pellard. The comparative study of the Japonic languages. Approaches to endangered languages in Japan and Northeast Asia: Description, documentation and revitalization, National Institute for Japanese Language and Linguistics, Aug 2018, Tachikawa, Japan. ffhal-01856152
↑ Masayoshi Shibatani, 1990. The Languages of Japan, p. 207.
