Ellwood, Robert S. Jr
Wardsworth, 1980
Buku Teks
Jabbar, Muhammad Abdul
University of Malaya Press, 1981
Buku Teks
edited by Brian Tierney, Donald Kagan, and L. Pearce Williams; consulting editor: Eugene Rice.
Random House, 1968
Buku Teks
Schweitzer, Albert
Macmillan, 1959
Buku Teks
Frankfort, Henri, author
Doubleday, 1948
Buku Teks