McColvin, Lionel R., author
UNESCO , 1986
Buku Teks
Fasick, Adele M., author
Libraries Unlimited , 1991
Buku Teks
Sullivan, Michael, author
American Library Association, 2005
eBooks
Sullivan, Michael, author
American Library association, 2005
eBooks
Blanshard, Catherine, author
Library Association Publishing, 1998
Buku Teks