Albig, WIlliam
McGraw-Hill, 1939
Buku Teks
Lane, Robert E.
Prentice-Hall, 1964
Buku Teks
Albig, WIlliam
McGraw-Hill, 1939
Buku Teks
Doob, Leonard William, 1909-
The Cresset Press, 1948
Buku Teks
edited by Bernard Berelson and Morris Janowith
Free Press, 1966
Buku Teks