Morrison, Alastair M., author
Delmar, 1996
Buku Teks
Hsu, Cathy H.C.,, author
John Wiley & Sons, 2001
Buku Teks
Metelka, Charles J., author
Delmar, 1990
Buku Referensi
Kotler, Philip, author
Prentice-Hall, 1998
Buku Teks
Kotler, Philip, author
Pearson Education, 2014
Buku Teks