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

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

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