Library Association , 2000
Buku Teks
Routledge, 1997
Buku Teks
McAvinia, Claire, author
Chandos Publishing, an imprint of Elsevie, 2016
Buku Teks
Gordon, Robert Aaron, author
Columbia University Press, 1959
Buku Teks
editor, Burton R. Clark
Pergamon Press, 1992
Buku Referensi