Be a network marketing superstar
Christensen Mary, Christensen WayneKniha
Citace v seznamu literatury:
CHRISTENSEN, Mary a CHRISTENSEN, Wayne. Be a network marketing superstar: the one book you need to make more money than you ever thought possible. New York: AMACOM, c2007. ISBN 9780814474310. Dostupné také z: http://www.loc.gov/catdir/toc/ecip078/2007000387.html.