Malassis, Louis, author
Gunung Agung, 1981
Buku Teks
edited by Jack Rothman [and others]
Peacock, 1995
Buku Teks
Sarlito Wirawan Sarwono, author
BPKM FKM UI, 1980
Buku Teks
edited by Ralph M. Kramer and Harry Specht
Prentice-Hall, 1969
Buku Teks
Sower, Christopher
Free Press, 1957
Buku Teks