Hubell, Jay Broadus, author
Macmillan, 1922
Buku Teks
Arp, Thomas R., author
Macmillan, 1966
Buku Teks
Wheeler, Charles B., author
W.W. Norton, 1966
Buku Teks
Drury, John, author
Writer`s Digest Books, 1991
Buku Teks
Drury, John, author
Story Press, 1995
Buku Referensi