Zoltners, Andris A., author
[American Management Association, ], 2006
eBooks
Cummins, Julian, author
Universal Book Stall, 1991
Buku Teks
Bob Gordon, consultant editor; Maggie Gordon, consultant editor
Watson-Guptill Publications, 2002
Buku Teks
Priemer, August B., author
Lexington Books, 1989
Buku Teks
Barry, John W., author
McGraw-Hill, 1981
Buku Teks