Drucker, P. F. (1985). Innovation and entrepreneurship: Practice and principles. Harper & Row.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter Ferdinand. Innovation and Entrepreneurship: Practice and Principles. New York: Harper & Row, 1985.
Lua MLA (9ú heag.)Drucker, Peter Ferdinand. Innovation and Entrepreneurship: Practice and Principles. Harper & Row, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.