Stein, Ben
Gramedia, 2006
Buku Teks
Una Amanda Priharani
2004
UI - Skripsi (Membership)
Yusak Novanto
2001
UI - Skripsi (Membership)
Siagian, Eva Grace Rouli
2002
UI - Skripsi (Membership)
Riana Sahrani
Fakultas Psikologi Universitas Indonesia, 1995
UI - Skripsi (Membership)