Okinawan-English Wordbook 図書 Mitsugu Sakihara ·2006-12-31 ·『University of Hawaii Press eBooks』 doi:10.1515/9780824841683
Dialects in Japanese Monkeys: Vocal Learning and Cultural Transmission of Locale-specific Vocal Behavior? 論文 Steven Green ·2010-04-26 ·『Zeitschrift für Tierpsychologie』 38(3) pp. 304-314 doi:10.1111/j.1439-0310.1975.tb02006.x