Artikel Jurnal
Armey, Dick
Fawcett Columbine, 1996
Buku Teks
Fisher, Patricia H., author
[American Library association, American Library association], 2006
eBooks
Lancaster, F. Wilfrid, author
Uninersity of Illinois, 1993
Buku Teks
Lancaster, F. Wilfrid, author
The Library Association, 1988
Buku Teks