Koh, Yunkon, author
Alex Media Komputindo, 2012
Buku Teks
Ken-Ichi Kawakatsu
Japan Travel Bureau, 1960
Buku Teks
Rawuh, author
Erlangga, 1981
Buku Teks
Tobin, Allan J., author
Harcourt College Publishing, 2001
Buku Teks
Burton R. Clark, Guy R. Neave, editors-in-cheif
Pergamon Press, 1992
Buku Referensi