Cambridge University Press, 1997
eBooks
Ottenheimer, Harriet Joseph, author
Cengage, 2013
Buku Teks
Ahearn, Laura M. author
John Wiley & Sons, Incorporated,, 2016
Buku Teks
edited by M. Dale Kinkade, Kenneth L. Hale and Oswald Werner
Peter De Ridder Press, 1975
Buku Teks
Cambridge University Press, 2006
eBooks