Bradley, Phil, author
Library Association Publishing, 1999
Buku Referensi
Sams Publishing, 1995
Buku Referensi
Bradley, Phil, author
Lawrence Erlbaum Associates, 1999
Buku Teks
Bradley, Phil, author
Facet Publishing, 2004
Buku Teks
Hock, Randolph, author
Cyber Age Books, 2004
Buku Teks