Sky, Alison
New York: McGraw-Hill, 1976
Buku Teks
Rossiter, Clinton, 1917-1970, author
Alfred A. Knopf, 1956
Buku Teks
Bailey, Stephen K., author
Henry Holt, 1957
Buku Teks
Estell, Kenneth
Visible Ink Press, 1994
Buku Teks
Slocum, Stephanie A., author
Syracuse University Press, 2003
Buku Teks