APA (7th ed.) Citation

Drucker, P., Hesselbein, F., & Kuhl, J. (2015). Peter Drucker's Five Most Important Questions (1st edition.). Jossey-Bass.

Chicago Style (17th ed.) Citation

Drucker, Péter, Frances Hesselbein, and Joan Kuhl. Peter Drucker's Five Most Important Questions. 1st edition. Jossey-Bass, 2015.

MLA (9th ed.) Citation

Drucker, Péter, et al. Peter Drucker's Five Most Important Questions. 1st edition. Jossey-Bass, 2015.