Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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