Drucker, P. (1985). Innovation and entrepreneurship. Heinemann.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter. Innovation and Entrepreneurship. London: Heinemann, 1985.
Lua MLA (9ú heag.)Drucker, Peter. Innovation and Entrepreneurship. Heinemann, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.