Osborne, Larry N.
Libraries Unlimited , 2000
Buku Teks
by Peter Brophy [and others]
Brookfield, Vt. Gower , 1990
Buku Teks
Cohn, John M.
Neal-Schuman, 2001
Buku Teks
Cohn, John M.
Facet Publishing, 2002
Buku Teks
Westlake, Duncan R.
Ashgate, 1992
Buku Referensi