Boyatzis, Richard E.
John Wiley & Sons, 1982
Buku Teks
This, Leslie E.
Adison Wesley Publishing, 1974
Buku Teks
Torrington, Derek, 1931-
Prentice-Hall, 1989
Buku Teks
Torrington, Derek, 1931-
Prentice-Hall, 1994
Buku Teks
Munford, Alan, author
McGraw-Hill, 1980
Buku Teks