Cunningham, Sarah
Oxford University Press, 1994
Buku Teks
Cotton, David
Pearson Education Limited, 2012
Multimedia
O`Connell, Daniel C.
[Springer, ], 2012
eBooks
Zweifel, Thomas D.
Selectbooks, 2009
Buku Teks
Dean, Howard H.
Prentice-Hall, 1962
Buku Teks