Kennan, George F., 1904-, author
Princeton University Press , 1954
Buku Teks
Kramish, Arnold, author
Harper & Row, 1963
Buku Teks
McCormick, James M., author
Thomson, 2005
Buku Teks
Herrick, Christopher, author
Longman, 2003
Buku Teks
Rourke, Francis E., author
John Hopkins University Press, 1972
Buku Teks