Herrick, Christopher, author
Longman, 2003
Buku Teks
Suzie Sri Suparin S. Sudarman, author
Jurnal Studi Amerika, 2005
Artikel Jurnal
Artikel Jurnal
Kennan, George F., 1904-, author
Princeton University Press , 1954
Buku Teks
McCormick, James M., author
Thomson, 2005
Buku Teks