Hatch, John, author
Frederick A. Praeger, 1962
Buku Teks
Hawkins, David E., author
Palgrave-Macmillan, 2006
Buku Teks
Davis, H.L., author
William Morrow, 1952
Buku Teks
Lerner, Max, author
Simon and Schuster, 1957
Buku Teks
Powelson, John P., author
McGraw-Hill , 1964
Buku Teks