Geertz, Clifford, author
Polity Press, 1988
Buku Teks
Field, Henry
Doubleday, 1953
Buku Teks
The United States Conggress 1980, 1980
Buku Teks
Musser, Charles, author
Macmillan Library reference USA,, 1990
Buku Referensi
J.G.E. Hopkins, Florett Robinson, Le Roy H. Appleton, James Truslow Adams, editor
Charles Scribner's Sons, 1960
Buku Referensi