Edwards, George C., author
Thomson, 2006
Buku Teks
Edwards, George C., author
Thomson Wadworth, 2006
Buku Teks
Hunter, Robert E., author
Praeger, 1982
Buku Teks
Stein, Theodore J., author
Columbia University Press, 2001
Buku Teks
Suzie Sri Suparin S. Sudarman, author
Jurnal Studi Amerika, 2005
Artikel Jurnal