Thornton, Geoffrey
Edward Arnold, 1980
Buku Teks
Scales, Peter, 1949-, author
Open University Press, 2013
Buku Teks
Richards, Jack C., author
Cambridge University Press, 2017
Buku Teks
Ag. Bambang Setiyadi, author
Graha Ilmu, 2018
Buku Teks
Kenny, Philip H.
Butterworth, 1994
Buku Teks