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Existenzgründung : Handbuch für Berater und Unternehmensgründer
Wollny, Paul, (1998)
Consulting for real people : a client-centred approach for change agents and leaders
Cockman, Peter, (1999)
High impact consulting : how clients and consultants can leverage rapid results into long-term gains
Schaffer, Robert H., (1997)
The marketing plan
Cohen, William A., (2005)
Building a mail order business : a complete manual for success
Cohen, William A., (1996)
Model business plans for service businesses
Cohen, William A., (1995)