Czinkota, Michael R., author
The Dryden Press, 1996
Buku Teks
edited by Yahya R. Kamalipour
Thomson, Wadsworth, 2007
Buku Teks
Keegan, Warren J., author
Pearson, 2011
Buku Teks
Payne, Richard J., 1949-, author
Pearson Education , 2014
Buku Teks
Keegan, Warren J., author
Prentice-Hall, 1999
Buku Teks