Customer loyalty guaranteed
Bell Chip R., Patterson John R.Kniha
Citace v seznamu literatury:
BELL, Chip R. a PATTERSON, John R. Customer loyalty guaranteed: create, lead, and sustain remarkable customer service. Avon, Mass.: Adams Media, c2007. ISBN 9781598694680. Dostupné také z: http://www.loc.gov/catdir/toc/ecip0717/2007018991.html.