Douglas, William O.
Doubleday, 1961
Buku Teks
Schawartz, Bernard
Oxford University Press, 1977
Buku Teks
Rutland, Robert Allen
Collier-Macmillan Ltd., 1969
Buku Teks
edited by Richard L. Perry and John C. Cooper
American Bar Foundation, 1964
Buku Teks
Weinberger, Andrew D.
Chandler Publishing, 1962
Buku Teks