Padfield, Tim, author
Facet Publishing, 2005
Buku Teks
Foxley, Eric, author
Addison-Wesley, 1985
Buku Teks
Glass, Graham, author
Prentice-Hall, 1999
Buku Teks
Spiller, David, author
Library Association Publishing, 2000
Buku Teks
Jordan, Peter, author
Gower, 1998
Buku Teks