John Wiley & Sons , 2009
Buku Teks
edited by Rosalind S. Miller, and Helen Rehr
Prentice-Hall, 1983
Buku Teks
edited by Cary L. Cooper, James Campbell Quick, Marc J. Schabracq
John Wiley & Sons, 2009
Buku Teks
Ellis, Niki, author
Oxford University Press, 2001
Buku Teks
Levinson, Harry
The Levinson Insitute, 1964
Buku Teks