Brudney, Kent M., author
Thomson, 2003
Buku Teks
edited by Richard M. Ludwig, Clifford A. Nault
Oxford University Press , 1986
Buku Referensi
edited by Bruce Catton
American Heritage, 1958
Buku Teks
edited by Edwin Seaver
World Pub., 1948
Buku Teks
edited by Hennig Cohen
Basic Book, 1969
Buku Teks