Fallows, James M., author
Houghton Mifflin, 1989
Buku Teks
Joy Hakim, author
Oxford University Press, 2003
Buku Teks
Preston, Andrew, author
Oxford University Press, 2017
eBooks
Alfred A. Knopf, 1983
Buku Teks
Killblane, Richard E., author
Emerald Publishing Limited, 2019
eBooks