Hildebrand, David K., 1940-
Duxbury Press, 1996
Buku Teks
Chapman and Hall/CRC, 2007
eBooks
Haines, Stephen G.
HRD Press, 1998
Buku Teks
Katcher, Bruce Leslie
American Management Association, 2007
eBooks
Ekambaram, S. K.
Asia Publishing House, 1960
Buku Teks