Bower, Marvin
Massachutts Harvard University Press , 1949
Buku Teks
Nollen, Stanley D.
New York Amacon c.1978,
Buku Teks
Kurian, George Thomas
Amacom, 2013
Buku Referensi
Tobin, Daniel R., 1946-
American Management Association, 2008
eBooks
edited by Paul C. Dinsmore, Jeannette Cabanis-Brewin
American Management Association, 2006
eBooks