Leith, John D., author
Burgess, 1970
Buku Teks
Baum, Stuart J.
Macmillan, 1972
Buku Teks
Kalat, James W., author
Thomson/Wadsworth, 2007
Buku Teks
edited by Herman P. Schwan
McGraw-Hill, 1969
Buku Teks
editors: R. T. Bottle, [and] H. V. Wyatt
Butterworth, 1971
Buku Referensi