Albert, Kenneth J., author
McGraw-Hill, 1981
Buku Teks
Oosterwal, Dantar P., author
American Management Association;, 2010
eBooks
Rosenthal, Stephen R., author
Business One Irwin, 1992
Buku Referensi
Green, Charles H., author
McGraw-Hill , 2012
Buku Teks
Fitzpatrick, Rob, author
Amazon, 2014
Buku Teks