APA (7th ed.) Citation

Drucker lhPeter F. Management challenges for the 21st centrury.

Chicago Style (17th ed.) Citation

Drucker lhPeter F. Management Challenges for the 21st Centrury. Oxford lbButterworth Heinemann lc1999.

MLA (9th ed.) Citation

Drucker lhPeter F. Management Challenges for the 21st Centrury.

Warning: These citations may not always be 100% accurate.