Matthews, Janice R., author
Cambridge University Press, 2016
Buku Teks
Denning, Melita
Llewellyn Publications, 1993
Buku Teks
Oxford University Press, 1979
Buku Teks
Evans, A. J.
Unesco, 1977
Buku Referensi
Herner, Saul
Information Resources Press, 1980
Buku Referensi