Colston, Catherine
Cavendish Publishing, 1999
Buku Teks
edited by A. James Casner
Little, Brown, 1952
Buku Teks
Lang, Jon
Sweet & Maxwell, 2006
Buku Teks
Cunningham, Roger A.
West Pub., 1993
Buku Teks
Freyermuth, R. Wilson
Thomson/West, 2011
Buku Teks