Westview Press , 1984
Buku Teks
McCormick, James M.
Thomson, 2005
Buku Teks
edited by Richard P. Stebbins
Published for the Council on Foreign Relations by Simon and Schuster, [1939-1970], 1963
Buku Teks
edited by Richard P. Stebbins
American Book-stratford Press, 1963
Buku Teks
Tiller, R. Mark
St. Martin's Press , 1997
Buku Teks