McNamee, Stephen J., 1950-, author
Rowman and Littlefield, 2014
Buku Teks
May, Rollo, 1909-, author
W.W. Norton, 1991
Buku Teks
Cassirer, Ernst, author
Dover, 1946
Buku Teks
Ferkiss, Victor C.
Braziller, 1969
Buku Teks
Larue, Gerald A.
Prentice-Hall, 1975
Buku Teks