edited by Max S. Wortman
Allyn and Bacon , 1970
Buku Teks
Bolton, Robert, author
American Management Association, 1984
eBooks
Bobko, Philip, author
McGraw-Hill, 1995
Buku Teks
Craig, David R.
McGraw-Hill , 1941
Buku Teks
edited by Margaret S. Stockdale, Faye J. Crosby
Blackwell, 2004
Buku Teks