Martin, Lawrence L, author
Sage Publications, 2013
eBooks
Hradesky, John L., author
McGraw-Hill, 1995
Buku Referensi
Bank, John, author
Prentice-Hall, 2000
Buku Teks
Fandy Tjiptono, author
Andi Offset, 1996
Buku Teks
Fandy Tjiptono, author
Andi Offset, 2003
Buku Teks