Shimoji, Michinori (2010). "Ryukyuan Languages: An Introduction". Dalam Shimoji, Michinori; Pellard, Thomas (ed.). An Introduction to Ryukyuan Languages(PDF). Tokyo: Research Institute for Languages and Cultures of Asia and Africa. hlm. 2. ISBN9784863370722. Diarsipkan dari asli(PDF) tanggal 2016-07-05. Diakses tanggal 24 September 2016.
Shimoji, Michinori (2010). "Ryukyuan Languages: An Introduction". Dalam Shimoji, Michinori; Pellard, Thomas (ed.). An Introduction to Ryukyuan Languages(PDF). Tokyo: Research Institute for Languages and Cultures of Asia and Africa. hlm. 2. ISBN9784863370722. Diarsipkan dari asli(PDF) tanggal 2016-07-05. Diakses tanggal 24 September 2016.