Dale, Margaret, author
Crest Publishing House, 1999
Buku Teks
Bacal, Robert, author
Mc Graw-Hill, 1999
Buku Teks
Armstrong, Micahel
Kogan Page, 2015
Buku Teks
Bacal, Robert, author
Gramedia Pustaka Utama, 2002
Buku Teks
Fakultas Psikologi Universitas Indonesia, 2002
UI - Tesis (Membership)