Hand, D.J., author
John Wiley & Sons, 1981
Buku Teks
Fredman, Sandra, author
Oxford University Press, 2011
Buku Teks
edited by Craig Donnellan
Independence Educational, 1995
Buku Teks
Bradley, Harriet, author
Polity press, 2007
Buku Teks
Mayes, Pat, author
Longman, 1986
Buku Teks