edited by William O`Donohue and Kyle Ferguson
Sage, 2003
Buku Teks
Yuni Trie Imanti, author
Fakultas Psikologi Universitas Indonesia, 1994
UI - Skripsi Membership
Ari Kartika Dewa, author
Universitas Indonesia, 1988
UI - Skripsi (Membership)
Naisaban, Ladislaus
Grasindo, 2004
Buku Teks
Boere, C. George, author
Prismasophie, 2006
Buku Teks