Cuming, Maurice W.
Heinemann, 1971
Buku Teks
Casteleyn, Mary, author
Bowker Saur , 1993
Buku Teks
consultant editor, Michael Armstrong
AP Information Services, 1997
Buku Referensi
Dale, Margaret, author
Kogan Page Limited, 2003
Buku Teks
edited by Margaret Oldroyd
Library Association , 1997
Buku Teks