Maddux, Robert B., author
Erlangga, 2001
Buku Teks
editor, M.J. Dooher ; associate editor, V. Marquis
American Management Association, 1953
Buku Teks
Tobin, Daniel R., 1946-
American Management Association, 2008
eBooks
Heyel, Carl, author
American Management Association, 1960
Buku Teks
World Executive's Digest, 1981
Buku Teks