edited by Ronald Bayer [and others]
Oxford University Press, 2007
Buku Teks
Johnson, James A., author
Delmar Cengage Learning, 2013
Buku Teks
Powers, Madison, author
Oxford University Press, 2006
Buku Teks
Rom, William N., author
Jossey- Bass, 2012
Buku Teks
Crawford, John C., author
Chandos, 2013
eBooks