Reni Akbar Hawadi, author
Grasindo, 2003
Buku Teks
Roosdiana, author
Fakultas Psikologi Universitas Indonesia, 1988
UI - Skripsi Membership
Curiosita, 2004
Buku Teks
Gregory, Julie, author
Gramedia Pustaka Utama, 2005
Buku Teks
Buzan, Tony, author
Gramedia Pustaka Utama , 2005
Buku Teks