Spirkin, A.G.
The origin of language
[publisher not identified], [date of publication not identified]
 Buku Teks
Diamond, A. S. (Arthur Sigismund)
The History and origin of language / A.S. Diamond
Methuen , 1959
 Buku Teks
Noriko Takada
Japanese : breakthrough language series
Macmillan, 1995
 Buku Teks
Frellesvig, Bjark
A history of the Japanese language
Cambridge University Press, 2010
 Buku Teks
Chomsky, Noam
Knowledge of language : its nature, origin, and use
Praeger , 1986
 Buku Teks