Sampson, Edward G.
John Wiley & Sons, 1976
Buku Teks
edited by Raymond Cochrane and Douglas Carrol
Falmer Press, 1991
Buku Teks
DeLamater, John D.
Colorado Westview Press, 2014
Buku Teks
Taylor, Shelley E.
Prentice-Hall, 1997
Buku Teks
Baron, Robert A.
Allyn and Bacon , 1997
Buku Teks