DRUCKER P.F. (1955). PRACTICE OF MANAGEMENT. PAN BOOKS LTD.
Lua i Stíl Chicago (17ú heag.)DRUCKER P.F. PRACTICE OF MANAGEMENT. LONDON: PAN BOOKS LTD, 1955.
Lua MLA (9ú heag.)DRUCKER P.F. PRACTICE OF MANAGEMENT. PAN BOOKS LTD, 1955.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.