Assen, M. v., Berg, G. V. d., & Pietersma, P. (2009). Key management models: The 60+ models every manager needs to know (2nd ed.). Harlow, England: Financial Times/Prentice Hall.

Assen, Marcel van, Gerben Van den Berg, and Paul Pietersma. Key Management Models: The 60+ Models Every Manager Needs to Know. 2nd ed. Harlow, England: Financial Times/Prentice Hall, 2009.

Assen, Marcel van, Gerben Van den Berg, and Paul Pietersma. Key Management Models: The 60+ Models Every Manager Needs to Know. 2nd ed. Harlow, England: Financial Times/Prentice Hall, 2009.