Shimoji (2010), pp. 9–10. Shimoji, Michinori (2010), "Ryukyuan languages: an introduction", in Shimoji, Michinori; Pellard, Thomas (eds.), An Introduction to Ryukyuan Languages(PDF), Tokyo: Research Institute for Languages and Cultures of Asia and Africa, pp. 1–13, ISBN978-4-86337-072-2.
Pellard (2018), p. 2. ——— (2018), "The comparative study of the Japonic languages", Approaches to endangered languages in Japan and Northeast Asia: Description, documentation and revitalization, Tachikawa, Japan: National Institute for Japanese Language and Linguistics.
Vovin (2013), pp. 222–224. ——— (2013), "From Koguryo to Tamna: Slowly riding to the South with speakers of Proto-Korean", Korean Linguistics, 15 (2): 222–240, doi:10.1075/kl.15.2.03vov.
de Boer (2020), p. 55. de Boer, Elisabeth (2020), "The classification of the Japonic languages", in Robbeets, Martine; Savelyev, Alexander (eds.), The Oxford Guide to the Transeurasian Languages, Oxford University Press, pp. 40–58, doi:10.1093/oso/9780198804628.003.0005, ISBN978-0-19-880462-8.
de Boer (2020), p. 52. de Boer, Elisabeth (2020), "The classification of the Japonic languages", in Robbeets, Martine; Savelyev, Alexander (eds.), The Oxford Guide to the Transeurasian Languages, Oxford University Press, pp. 40–58, doi:10.1093/oso/9780198804628.003.0005, ISBN978-0-19-880462-8.
de Boer (2020), p. 58. de Boer, Elisabeth (2020), "The classification of the Japonic languages", in Robbeets, Martine; Savelyev, Alexander (eds.), The Oxford Guide to the Transeurasian Languages, Oxford University Press, pp. 40–58, doi:10.1093/oso/9780198804628.003.0005, ISBN978-0-19-880462-8.
Vovin (2013), p. 232. ——— (2013), "From Koguryo to Tamna: Slowly riding to the South with speakers of Proto-Korean", Korean Linguistics, 15 (2): 222–240, doi:10.1075/kl.15.2.03vov.
Vovin (2013), pp. 236–237. ——— (2013), "From Koguryo to Tamna: Slowly riding to the South with speakers of Proto-Korean", Korean Linguistics, 15 (2): 222–240, doi:10.1075/kl.15.2.03vov.
Shimoji (2022), p. 11. ——— (2022), "The Japonic Languages: an Introduction", in Shimoji, Michinori (ed.), An Introduction to the Japonic Languages: Grammatical Sketches of Japanese Dialects and Ryukyuan Languages, Endangered and Lesser-Studied Languages and Dialects, vol. 1, Leiden: Brill, pp. 1–24, doi:10.1163/9789004519107, ISBN978-90-04-51910-7.
Shimoji (2022), pp. 14–15. ——— (2022), "The Japonic Languages: an Introduction", in Shimoji, Michinori (ed.), An Introduction to the Japonic Languages: Grammatical Sketches of Japanese Dialects and Ryukyuan Languages, Endangered and Lesser-Studied Languages and Dialects, vol. 1, Leiden: Brill, pp. 1–24, doi:10.1163/9789004519107, ISBN978-90-04-51910-7.
Shimoji (2022), p. 13. ——— (2022), "The Japonic Languages: an Introduction", in Shimoji, Michinori (ed.), An Introduction to the Japonic Languages: Grammatical Sketches of Japanese Dialects and Ryukyuan Languages, Endangered and Lesser-Studied Languages and Dialects, vol. 1, Leiden: Brill, pp. 1–24, doi:10.1163/9789004519107, ISBN978-90-04-51910-7.
Shimoji (2022), pp. 15–18. ——— (2022), "The Japonic Languages: an Introduction", in Shimoji, Michinori (ed.), An Introduction to the Japonic Languages: Grammatical Sketches of Japanese Dialects and Ryukyuan Languages, Endangered and Lesser-Studied Languages and Dialects, vol. 1, Leiden: Brill, pp. 1–24, doi:10.1163/9789004519107, ISBN978-90-04-51910-7.
Patrie (1982), p. 4. Patrie, James (1982), The Genetic Relationship of the Ainu Language, Oceanic Linguistics Special Publications, vol. 17, University of Hawai'i Press, ISBN978-0-8248-0724-5, JSTOR20006692.