Kneller, George F., author
John Wiley & Sons, 1965
Buku Teks
Borg, Walter R.
David Mc Kay Co., 1963
Buku Teks
edited by Christina Hughes
Open University Press, 2003
Buku Teks
Allyn and Bacon , 1971
Buku Teks
by Arthur I. Gates [and others]
Macmillan, 1962
Buku Teks