Hacker, Louis M., author
Appleton-Century-Crofts, 1949
Buku Teks
The John Hopkins University Press, 1980
Buku Teks
Institute of International Relations , 1988
Buku Teks
The Academy of Political Science, 1977
Buku Teks
Bedford, Henry F., author
Harcourt Brace Jovanovich, 1972
Buku Teks