The power of loyalty
Brooks Roger L.Kniha
Citace v seznamu literatury:
BROOKS, Roger L. The power of loyalty: 10 essential steps to build a successful customer loyalty strategy. [Irvine, Calif.]: Entrepreneur Press, 2010. ISBN 9781599183930. Dostupné také z: http://www.loc.gov/catdir/enhancements/fy1012/2010006662-d.html.