edited by Lawrence S. Wringtsman
Wadsworth, 1968
Buku Teks
Sampson, Edward G., author
John Wiley & Sons, 1976
Buku Teks
edited by Raymond Cochrane and Douglas Carrol
Falmer Press, 1991
Buku Teks
DeLamater, John D., author
Colorado Westview Press, 2014
Buku Teks
Baron, Robert A., author
Pearson, 2009
Buku Teks