Lippincott, Isaac, author
Appleton Century Croffs, 1933
Buku Teks
Mason, Edward S., author
Claremont College for the four associated colleges at Claremont, 1955
Buku Teks
Kemmerer, Donald L., author
Littlefield, Adams, 1956
Buku Teks
Beard, Charles A., author
Macmillan, 1957
Buku Teks
Randall, Clarence B., author
University of Chicago Press, 1954
Buku Teks