Kolb, David A., author
Prentice-Hall, 1984
Buku Teks
edited by Edwin A. Fleishman
Dorsey Press, 1967
Buku Teks
Reis, Matthew, author
American Management Association, 2010
eBooks
Finlay, William W., author
McGraw-Hill, 1955
Buku Teks
Filley, Alan C., author
Scott, Foresman, 1969
Buku Teks