Commager, Henry Steele, selector
Yale University Press, 1950
Buku Teks
Mauk, David, author
Routledge, 1997
Buku Teks
Abel, Darrel, author
Barron's Educational Series, 1963
Buku Referensi
Hughes, Robert, author
Alfred A. Knopf, 1997
Buku Teks
Gordon, Lois
Yale University Press, 1999
Buku Teks