//-->
BizTalk : implementing business to business e-commerce
Kobielus, James G.,
Permission-Marketing macht Kunden süchtig
Schwarz, Torsten, (2000)
The one to one future : building relationships one customer at a time
Peppers, Don, (1997)
Database marketing : the ultimate marketing tool
Nash, Edward L., (1993)
Direct marketing : strategy, planning, execution
Nash, Edward L., (1995)