Poulter, Alan, author
Library Association Publishing, 2000
Buku Referensi
Poulter, Alan, author
Facet Publishing , 2005
Buku Teks
Griffiths, Peter, author
Facet, 2004
Buku Teks
Manger, Jason J., author
McGraw-Hill, 1995
Buku Referensi
Nelson, Stephen L., author
Elex Media Komputindo , 1996
Buku Teks