Hartley, R.J.
Bowker-Saur, 1990
Buku Teks
Tenopir, Carol
Libraries Unlimited, 1989
Buku Teks
Nicholas, David
Mansell Publishing, 1988
Buku Teks
written by the Staff of the Science and Technology Information Service
British Library , 1991
Buku Teks
Chowdhury, G.G.
Library Association, 2001
Buku Teks