Drucker, P. F. (1991). Innovation & entrepreneurship. Altrliated east- west.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter F. Innovation & Entrepreneurship. New delhi: Altrliated east- west, 1991.
Lua MLA (9ú heag.)Drucker, Peter F. Innovation & Entrepreneurship. Altrliated east- west, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.