Reitz, Joan M., author
Libraries Unlimited, 2004
Buku Referensi
edited by Alice Gertzog
McFarland, 1989
Buku Teks
Kochtanek, Thomas R., author
Libraries Unlimited , 2002
Buku Teks
Evans, G. Edward, 1937-, author
Libraries Unlimited , 2005
Buku Teks
Jordan, Peter, author
Gower , 1995
Buku Teks