BBC Worldwide Limited, 2004
Multimedia
Cohen, Larry, author
Oxford University Press, 2016
eBooks
Garrett, Ginger, 1968-, author
NavPress Indonesia, 2007
Buku Teks
edited by Patricia Clarke and Dale Spender
NSW Allen & Unwin , 1992
Buku Teks
Cabot, Meg, author
Harper Trophy, 2000
Buku Teks