Nakata, Norio. Kōza Kokugoshi: Dai 2 kan: On'inshi, Mojishi. Taishūkan Shoten. 1972 (日语). Shibatani, Masayoshi. The Languages of Japan. Cambridge University
Tomohiro; Doba, Nobutaka; Hinohara, Shigeaki; Mizutani, Tomohiko; Soma, Masayoshi (2007). "Genotyping of triallelic SNPs using TaqMan PCR". Molecular and
[Nihongo no keigo]. Tokyo: Japan Times. ISBN 4-7890-0338-8. Shibatani, Masayoshi. (1990). Japanese. In B. Comrie (Ed.), The major languages of east and