Andrews, Wayne
Macmillan, 1978
Buku Teks
Gelernter, Mark, author
Manchester University Press, 2001
Buku Teks
J.G.E. Hopkins, Florett Robinson, Le Roy H. Appleton, James Truslow Adams, editor
Charles Scribner's Sons, 1960
Buku Referensi
Ketchum, Richard M., author
American Heritage Publishing, 1960
Buku Teks
Harris, Cyril M., author
W.W. Norton, 1998
Buku Referensi