Kao, Raymond W.Y.
Prentice-Hall, 1995
Buku Teks
Lambing, Peggy A., author
Prentice-Hall, 2003
Buku Teks
Meredith, Geoffrey G., author
Pustaka Binaman Pressindo, 2000
Buku Teks
Fakultas Psikologi Universitas Indonesia, 2002
UI - Tesis (Membership)
Casson, Mark, author
Rajawali, 2012
Buku Teks