Reardon, Kathleen Kelley
Beverly Hills, 1981
Buku Teks
Roos, Raymon S., author
Prentice-Hall, 1985
Buku Teks
Brown, J.A.C. (James Alexander Campbell), 1911-1964, author
Penguin Books , 1972
Buku Teks
Clara Handayani, author
2001
UI - Skripsi (Membership)
Cialdini, Robert B., author
Kencana Prenada Media, 2007
Buku Teks