Anderson, Mark (2019). "Studies of Ryukyu-substrate Japanese". In Patrick Heinrich; Yumiko Ohara (eds.). Routledge Handbook of Japanese Sociolinguistics. New York: Routledge. pp. 441–457.
doi.org
Clarke, Hugh (2009). "Language". In Sugimoto, Yoshio (ed.). The Cambridge Companion to Modern Japanese Culture. Cambridge: Cambridge University Press. pp. 56–75. doi:10.1017/CCOL9780521880473. ISBN9781139002455. P. 65: "[...] over the past decade or so we have seen the emergence of a new
lingua franca for the whole prefecture. Nicknamed Uchinaa Yamatuguchi (Okinawan Japanese) this new dialect incorporates features of Ryukyuan phonology, grammar and lexicon into modern Japanese, resulting in a means of communication which can be more or less understood anywhere in Japan, but clearly marks anyone speaking it as an Okinawan."
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.
hal.science
theses.hal.science
Pellard (2009) and Karimata (1999). Pellard, Thomas (2009). Ōgami: Éléments de description d'un parler du Sud des Ryūkyū [Ōgami: Description of a Southern Ryukyuan language] (Thesis) (in French). Ecole des Hautes Etudes en Sciences Sociales. Karimata, Shigehisa (1999). "Onsei no men kara mita Ryūkyū shohōgen". In Gengogaku kenkyūkai (ed.). Kotoba no kagaku 9. Tokyo: Mugi shobō. pp. 13–85.
