Bush, Laura, author
Simon & Schuster, 2010
Buku Teks
Hiroshi, Mitani
International House of Japan, 2006
Buku Teks
Trudgill, Peter, author
Cambrigde University Press , 2016
Buku Teks
Yuen, Ren Chao, author
Harvard University Press, 1962
Buku Referensi
Halliday, M.A.K., author
Oxford University Press, 1989
Buku Teks