Hughes, Selwyn
Marshal Pickering , 1982
Buku Teks
Bloomfield, Harold H., author
Thorsons , 1995
Buku Teks
Eva Salsabilla, author
Fakultas Psikologi Universitas Indonesia, 2023
UI - Skripsi (Membership)
Papolos, Demitri F., author
HarperPerennial, 1992
Buku Referensi
The Guilford Press, 1987
Buku Teks