Cook, Arthur N., author
Littlefield Adams, 1969
Buku Teks
Rooney, D.D., author
George G. Harrap, 1967
Buku Teks
edited by Gerald Moore and Ulli Beier
Penguin Books, 1963
Buku Teks
SMU Press, 1966
Buku Teks
Carter, Gwendolen M., author
Frederick A. Praeger, 1961
Buku Teks