Isaac, Katherine
St. Martin's Press, 1977
Buku Teks
Touliatos, John, author
Iowa State University Press , 1988
Buku Teks
Bowers, Helen, author
Firefly Books, 2004
Buku Teks
Beaty, Wayne H., editor
McGraw-Hill Publishing Company, 1990
Buku Referensi
Lawless, Julia, author
Kyle Cathie, 1995
Buku Teks