edited by Leonard D. White
University of Chicago Press, 1945
Buku Teks
Liff, Stewart
American Management Association;, 2010
eBooks
Bernard, Hugh Y.
Oceania Publications, Inc., 1968
Buku Teks
Hamilton, Alexander
A Mentor Book, 1962
Buku Teks
Nowak, John E.
Thomson/West, 2010
Buku Teks