Beard, Charles A., author
Macmillan, 1942
Buku Teks
Kunstler, Mort, author
Harry N. Abrams, 1986
Buku Referensi
Smith, John E., author
Yayasan Sumber Agung , 1995
Buku Teks
Montesquieu, Charles de Secondat,1689-1755, author
Hafner Press, 1949
Buku Teks
Etzioni, Amitai, author
A Touchestone Book, 1994
Buku Teks