Levitt, Joel, author
Industrial Press, Inc., 2009
Buku Teks
edited by James J. O'Brien, Robert G. Zilly
McGraw-Hill, 1971
Buku Referensi
edited by David I. Cleland, Roland Gareis
McGraw-Hill, 1994
Buku Referensi
edited by Paul C. Dinsmore, Jeannette Cabanis-Brewin
American Management Association, 2006
eBooks
edited by Paul C. Dinsmore, Jeannette Cabanis-Brewin
American Management Association, 2011
eBooks