APA (7th ed.) Citation

Drucker, P. F. (1985). Innovation and entrepreneurship: Practice and principles. Harper & Row.

Chicago Style (17th ed.) Citation

Drucker, Peter Ferdinand. Innovation and Entrepreneurship: Practice and Principles. New York: Harper & Row, 1985.

MLA (9th ed.) Citation

Drucker, Peter Ferdinand. Innovation and Entrepreneurship: Practice and Principles. Harper & Row, 1985.