edited by Michael McCarthy
Cambridge University Press, 2016
Buku Teks
Norton, Lin S.
Routledge, 2009
Buku Teks
Brown, James Dean
Cambridge University Press, 1988
Buku Teks SO
Donald Freeman and Jack C. Richardsand
Cambridge Cambridge University Press 1996
Buku Teks
Brown, Douglas
Pearson Longman, 2007
Buku Teks