Gorman, Michael, author
[American Library association;American Library association, American Library association], 2005
eBooks
Harrod, Leonard Montague
England : Gower Pub, 1987,
Buku Referensi
Powell, Ronald R., author
Libraries Unlimited, Inc., 2004
Buku Teks
Simpson, I.S., author
Library Association, 1988
Buku Teks
edited by David Stern
Routledge, 2009
Buku Teks