Charney, Cyril, author
American Management Association, 2006
eBooks
Gellerman, Saul W.
Penguin Book, 1974
Buku Teks
Newstrom, John W., author
McGraw-Hill, 1975
Buku Teks
McNichols, Thomas J., author
McGraw-Hill, 1983
Buku Teks
Chruden, Herbert J.
South-Western Publishing Co., 1976
Buku Teks