edited by Norton Cinburg, Bruce Koppel and T.G. Mcgee
University of Hawaii Press, 1972
Buku Teks SO
Drake, St. Clair
Harper and Row, 1962
Buku Teks
Huxley, Aldous, 1894-1963
New York, Harper & Brothers, 1956
Buku Teks SO
Wolfe, Gerard R.
McGraw-Hill, 1994
Buku Referensi
edited by Robert Moore Fisher
Doubleday, 1955
Buku Teks SO