Hirsch, Barton J, author
American Psychological Association, 2005
Buku Teks
Wilson, Woodrow, author
Prentice-Hall, 1961
Buku Teks
Liston, Robert A., author
Dell Publishing, 1968
Buku Teks
Duncan, Otis Dudley, author
John Wiley & Sons, 1956
Buku Teks
edited by David Popenoe
Rutgers University Press, 1969
Buku Teks