Shi, Leiyu, author
Jones & Bartlett Learning, 2014
Buku Teks
Safian, Shelly C., author
Delmar, Cengage Learning, 2009
Buku Teks
Gardenswartz, Lee
Jossey-Bass Publishers, 1998
Buku Teks
Harrison, Carlene, author
Delmar Cengage Learning, 2013
Buku Teks
Toth, Jennifer
A Touchstone Book , 1997
Buku Teks