Kegley, Charles W. (Charles William), Jr., author
Wadsworth, 2009
Buku Teks
Kegley, Charles William, Jr., author
St. Martin`s Press, 1997
Buku Teks
Rourke, John T., author
Mc Graw Hill, 2009
Buku Teks
Barnes, James F., author
St. Martin`s Press, 1980
Buku Teks
Princeton University Press, 1980
Buku Teks