Bernard, Janine
Allyn and Bacon , 1998
Buku Teks
Bond, Meg, author
McGraw-Hill, 2010
Buku Teks
Hawkins, Peter, author
Open University Press, 2005
Buku Teks
Hannes Krall, Jutta Furst, Pierre Fontaine, editors
[Springer-VS, ], 2013
eBooks
Lisa Lynch [and others]
Wiley-Blackwell, 2008
Buku Teks