Scobie, Janet I.
George Allen and Unwin, 1959
Buku Teks
Haigh, Rupert, author
Routledge-Cavendish, 2009
Buku Teks
Messinger, Heinz, author
Langenscheidt, 1993
Buku Referensi
Puchta, Herbert
Cambridge University Press, 2010
Multimedia
Puchta, Herbert
Cambridge University Press, 2010
Multimedia