Coles, Robert.
Random House, 1997
Buku Teks
Lawrenhce Erlbaum Associates,, 2014
Buku Teks
Yessyca Diana Gabrielle
Fakultas Psikologi Universitas Indonesia, 1997
UI - Skripsi (Membership)
Artikel Jurnal
Chazan, Pauline, 1948-
Routledge, 1998
Buku Teks