edited by Miles M. Jackson
Greenwood Press, 1981
Buku Referensi
Beenham, Rosemary
Clive Bingley, 1990
Buku Teks
edited by Elizabeth M. Moys
Westview Press, 1976
Buku Teks
edited by Berelson, Bernard
American Library Association, 1949
Buku Teks
edited by H.A. Whatley
Library Association , 1977
Buku Teks