Ashcraft, Mark H., author
Longman, 1998
Buku Teks
Reed, Stephen K., author
Wadsworth and Cengage Learning, 2013
Buku Teks
Ashcraft, Mark H., author
Pearson, 2014
Buku Teks
Croker, Steve, author
Cengage Learning, 2012
Buku Teks
edited by Tim Dalgleish and Mick Power
John Wiley & Sons, 2000
Buku Teks