Ward, Ralph D.
John Wiley & Sons, 1997
Buku Teks
Yablonsky, Lewis, author
Wadsworth, 2000
Buku Teks
Nugent William R., author
Thomson Learning, 2001
Buku Teks
Che, Yuming, author
Foreign Language Press, 2008
Buku Teks
Images Publishing Group, 2011
Buku Referensi