Jordan, Peter
Gower , 1995
Buku Teks
Jordan, Peter
Ashgate, 2002
Buku Teks SO
Brophy, Peter
Aslib Gower, 1997
Buku Teks
Totterdell, Anne
Library Association Publishing, 2000
Buku Teks
consultant editor, Michael Armstrong
AP Information Services, 1997
Buku Referensi