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