edited by John Tingle and Alan Cribb
Blackwell, 2007
Buku Teks
Humphreys, Nick, author
Blackstone Press, 1999
Buku Teks
Uff, John, author
Sweet & Maxwell, 1981
Buku Teks
Edwards, Martin B., author
Kogan Page, 1991
Buku Teks
Edwards, Martin B., author
Kogan Page, 1993
Buku Teks