Hoffman, Frederick J.
University Press, 1960
Buku Teks
Laski, Harold J., author
George Allen and Unwin, 1946
Buku Teks
Michener, James A., author
Random House , 1968
Buku Teks
McNamara, Robert S., 1916-2009, author
Harper & Row, 1968
Buku Teks
Radhakrishnan, S. (Sarvepalli), 1888-1975, author
Harper & Brothers, 1956
Buku Teks