Lorch, Robert S., author
Wayne State University Press, 1969
Buku Teks
Scheb, John M., author
Thomson Wadworth, 2005
Buku Teks
Gellhorn, Ernest, author
West Publishing Company, 1972
Buku Teks
Levitan, David M.
Academy of Political Science, 1946
Buku Teks
Levitan, David M.
Academy of Political Science, 1946
Buku Teks