Siti Ismah Afwan, author
Fakultas Psikologi Universitas Indonesia, 1995
UI - Tesis (Membership)
Wall, Bob.,
Prima Publi, 1992
Buku Teks
Cohen, William A.
Prentice-Hall, 1990
Buku Teks
Allen, Scott J., author
American Management Association, 2011
Buku Teks
Arvan Pradiansyah, author
Gramedia, 2005
Buku Teks