Spengler, Joseph J. (Joseph John), 1902-1991, author
Duke Univrsity Press, 1979
Buku Teks
Ehrmann, Henry W., author
Little, Brown & Co., 1968
Buku Teks
Bainville, J.
Paris: Fayard, 1924
Buku Teks
Luethy, Herbert, author
New York Merdian Books 1959
Buku Teks
Guerard, ALbert
Ann Arbor The University of Michigan 1959
Buku Teks