Haworth Press, 1995
Buku Referensi
Gorman, Michael, author
[American Library association;American Library association, American Library association], 2005
eBooks
Powell, Ronald R., author
Libraries Unlimited, Inc., 2004
Buku Teks
Harrod, Leonard Montague
England : Gower Pub, 1987,
Buku Referensi
edited by G.E. Gorman
Facet, 2005
Buku Teks