DeVillers, Julia, author
Prima Pub, 2002
Buku Teks
Taylor, Andrew, author
University of Queensland Press, 1971
Buku Teks
Monica Christie, author
Fakultas Psikologi Universitas Indonesia, 2017
UI - Skripsi (Membership)
Drate, Spencer, author
North Light Books, 1999
Buku Referensi
Gilbert, Paul, author
Prestasi Pustaka, 2010
Buku Teks