Artikel Jurnal
Charles W. Kegley and Eugene R. Wittkopf, editor
McGraw-Hill, [2001, 2001]
Buku Teks
edited by Donna A. Champeau, Rebecca J. Donatelle, Julie A. Reeder
Pearson Custom Publishing, 2002
Buku Teks
Weihrich, Heinz, author
McGraw-Hill, 1993
Buku Teks
Dahringer, Lee D., author
Addison-Wesley, 1991
Buku Teks