Smith, Shawn, author
American Management Association, 2004
eBooks
Kadish, Jules E., author
Artech House , 1993
Buku Teks
Goad, Tom W., author
American Management Association, 1997
eBooks
Goad, Tom W., author
American Management Association, 1997
eBooks
Cheremisinoff, Nicholas P., author
M. Dekker, 1996
Buku Referensi