James, William
Dover, 1956
Buku Teks
Simbolon, Aladin Edivollo
Fakultas Psikologi Universitas Indonesia, 1989
UI - Skripsi (Membership)
Frances, Bryan:
Polity Press, 2014
Buku Teks
Kaniasari
1997
UI - Skripsi (Membership)
Bertyna Y.M.P.
Universitas Indonesia, 2002
UI - Skripsi (Membership)