Minife, James M.
McClelland and Stewart Limited, 1964
Buku Teks SO
Institute of International Relations , 1988
Buku Teks
The Academy of Political Science, 1977
Buku Teks SO
Frederick A. Praeger, 1966
Buku Teks SO
Stevenson, Adlai E.
Harper & Row, 1961
Buku Teks SO