Stone, Merlin
Customer Relationship Marketing
Crest, 2001
 Buku Teks
Indonesian capital market review
FEUI - Management Research Center (MRC), {s.a}
 Majalah, Jurnal, Buletin
Aaker, David A.
Strategic market management
John Wiley & Sons, 1984
 Buku Teks SO
The changin America market / editor of Fortun
N.Y. Honaver House , 1955
 Buku Teks SO
McGee, Frank
Customer service great ideas inspiration (strategi customer service perusahaan-perusahaan dunia dalam melayani dan menenangkan hati konsumen)
Prestasi Pustakarya, 2007
 Buku Teks SO