Mills, C. Wright, author
Oxford University Press, 1968
Buku Teks
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
Sumich, James L., author
Wm.C. Brown Pub., 1980
Buku Teks