Sauter, David
Delmar/Cengage Learning, 2011
Buku Teks
Longstaffe-Gowan, Todd
Yale University Press, 2001
Buku Teks
Tait, Alan A.
Edinburgh University Press, 1980
Buku Teks
Hall, Borden
Harper & Brothers, 1955
Buku Teks SO
Garland, Sarah
Francis Lincoln, 1995
Buku Teks