Friedland, Jerold A., author
Lexis, 2014
Buku Teks
Hanke, John E., author
Illinois Irwin, 1994
Buku Teks
Kozielski, Robert, author
Emerald, 2017
eBooks
De Mente, Boye, author
Tuttle, 2014
Buku Teks
edited by S. Prakash Sethi and Carl L. Swanson
John Wiley & Sons, 1981
Buku Teks