Cummings, Jack
Prentice-Hall, 1997
Buku Teks
Kau, James B., author
McGraw-Hill, 1985
Buku Teks
Shilling, James D., author
South-Western, 2002
Buku Teks
Hong, Yusheng, author
Zhengzhong Shuju, 1991
Buku Teks
David Y.W. Ho
Butterworth Asia, 1998
Buku Teks