Smith, Michael, author
Cambridge University Press , 2004
Buku Teks
Pojman, Louis P., author
Wadsworth and Cengage Learning, 2012
Buku Teks
Mdm Books, 2010
Multimedia
Harvard University Press, 1999
Buku Teks
Boss, Judith A., author
McGraw-Hill, 2004
Buku Teks