Whetten, David A., author
Prentice-Hall, 2005
Buku Teks
Camp, Sue C., author
Glencoe/McGraw-Hill, 2001
Buku Teks
Camp, Sue C., author
McGraw-Hill, 2001
Multimedia
Grellet, Francoise, author
Cambridge University Press, 1994
Buku Referensi
Whetten, David A., author
Prentice-Hall, 2007
Buku Teks