Johnson, Edgar N.
Cornell University Press, 1950
Buku Teks
Barnes, Harry Elmer
Prentice-Hall, 1950
Buku Teks
Wachtel, Paul L.
The Free Press, 1983
Buku Teks
Potter, David M.
Stanford University Press, 1976
Buku Teks
edited by Herbert Morris
Stanford University Press, 1961
Buku Teks