Vital, DAvid
Oxford University Press, 1971
Buku Teks
Byrd, Mary Jane
mcGraw-Hill , 2000
Multimedia
Sari Pietikainen ... [and others]
Cambridge University Press, 2016
Buku Teks
Goss, David
Routledge, 1991
Buku Teks
Kye, Woo-lee 1940-, author
Ewha Womans University Press, 2005
Buku Teks