Tompkins, Jonathan R., author
Wadsworth, 2005
Buku Teks
Milakovich, Michael E., author
Wadsworth and Cengage Learning, 2009
Buku Teks
Broom, Glen M., author
Prentice - Hall , 2009
Buku Teks
Soleh Soemirat, author
Remaja Rosdakarya, 2008
Buku Teks
Indian Institute of Management, 1991
Buku Teks