Drucker, P. F., Hesselbein, F., & Economy, P. (2015). Peter Drucker's five most important questions: Enduring wisdom for young leaders. John Wiley & Sons.
Chicago-referens (17:e uppl.)Drucker, Peter F., Frances Hesselbein, och Peter Economy. Peter Drucker's Five Most Important Questions: Enduring Wisdom for Young Leaders. Hoboken, New Jersey: John Wiley & Sons, 2015.
MLA-referens (9:e uppl.)Drucker, Peter F., et al. Peter Drucker's Five Most Important Questions: Enduring Wisdom for Young Leaders. John Wiley & Sons, 2015.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.