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