Drucker , P. (1993). Managing for results. Harper Business.
Lua i Stíl Chicago (17ú heag.)Drucker , Peter. Managing for Results. New York: Harper Business, 1993.
Lua MLA (9ú heag.)Drucker , Peter. Managing for Results. Harper Business, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.