McCamy, James L., author
Alfred A. Knopf, 1952
Buku Teks
Langdon, Robert M., author
Littlefield Adams, 1961
Buku Teks
Ferrell, Robert H., author
W.W. Norton, 1959
Buku Teks
Wittkopf, Eugene R., author
Thomson, 2002
Buku Teks
Leopold, Richard W., author
Alfred A. Knopf, 1962
Buku Teks