edited by Robert Keith Johnson
Cambridge University Press, 1994
Buku Teks
Richards, Jack C., author
Cambridge University Press, 2017
Buku Teks
Cook, Vivian, author
ARNOLD, 2001
Buku Teks
The Hankes Foundation, 1992
Multimedia
Saville-Troike, Muriel, 1936-, author
Cambridge University Press , 2006
Buku Teks