Leong, Carol L. H.
American Library Association, 1989
Buku Referensi
Edited by Cecilia Genereux, Paul D. Moeller
Libraries Unlimited, 2009
Buku Referensi
Richards, Jack C., author
Cambridge University Press, 2015
Buku Teks
Numrich, Carol
Longman, 1994
Buku Teks
edited by Ludo Verhoeven and Charles Perfetti
Cambridge University Press, 2017
Buku Teks