Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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