Artikel Jurnal
Fenvessy, Stanley J.
Dowjones-Irwin, 1976
Buku Teks
Parry, Julie, author
Librry Association Publishing, 1993
Buku Teks
Dewey, Barbara I., author
Oryx Press, 1987
Buku Teks
King, Ivan
Public Libraries Group of the Library Association, [1989]
Buku Referensi