Becker, Carl L. (Carl Lotus), 1873-1945, author
Alfred . A. Knopf, 1945
Buku Teks
Johnson, Edgar N., author
Cornell University Press, 1950
Buku Teks
Barnes, Harry Elmer, author
Prentice-Hall, 1950
Buku Teks
Wachtel, Paul L.
The Free Press, 1983
Buku Teks
Potter, David M.
Stanford University Press, 1976
Buku Teks