Hughes, Paul L., author
Littlefield, Adams, 1956
Buku Teks
Houghton Mifflin, 1985
Buku Teks
edited by John Louis Beatty, Oliver A. Johnson
Prentice-Hall, 1966
Buku Teks
Major, J. Russel, author
J.B. Lippincott, 1966
Buku Teks
Naidis, Mark, author
Dryden Press, 1972
Buku Teks