Jordan, Thomas E., author
The Falmer Press, 1989
Buku Teks
Wiggins, Sam P.
McCutchan Publishing Corporation, 1966
Buku Teks
DeVane, William Clyde, author
Harvard University Press, 1965
Buku Teks
American Council on Education, 1964
Buku Teks
Chidsey, Donald Barr
Crown Publishers, 1966
Buku Teks