Drucker, P. F. (1999). Managing for result. Butterworth-Heinemann.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter F. Managing for Result. Oxford: Butterworth-Heinemann, 1999.
Lua MLA (8ú heag.)Drucker, Peter F. Managing for Result. Butterworth-Heinemann, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.