Preston, Andrew, author
Oxford University Press, 2017
eBooks
Sally Burt, Daniel Añorve Añorve
Palgrave Macmillan, 2016
Buku Teks
Joy Hakim, author
Oxford University Press, 2003
Buku Teks
[compiled by] Paul F. Boller, Jr. and Ronald Story
Houghton Mifflin , 1988
Buku Teks
Killblane, Richard E., author
Emerald Publishing Limited, 2019
eBooks