Gardner, Howard, author
Basic Books, 1983
Buku Teks
Viaud, Gaston
Hutchirson & Co., 1968
Buku Teks
Marbun, Johannes, author
1997
UI - Tesis (Membership)
edited by Rom Harre
Basil Blackwell, 1976
Buku Teks
by Calvin S. Hall [and others]
John Wiley & Sons, 1985
Buku Teks