Keegan, Warren J., author
Prentice-Hall, 1999
Buku Teks
Hermawan Kartajaya, 1947-, author
Jakarta : Gramedia, 1998
Buku Referensi
Dahringer, Lee D., author
Addison-Wesley, 1991
Buku Teks
Keegan, Warren J., author
Prentice-Hall, 1997
Buku Teks
Perreault, William D., author
Irwin McGraw-Hill, 1999
Buku Teks