DRUCKER PETER F. (1980). MANAGING IN TRUBULENT TIMES. PAN BOOKS LTD.
Lua i Stíl Chicago (17ú heag.)DRUCKER PETER F. MANAGING IN TRUBULENT TIMES. GREAT BRITAIN: PAN BOOKS LTD, 1980.
Lua MLA (9ú heag.)DRUCKER PETER F. MANAGING IN TRUBULENT TIMES. PAN BOOKS LTD, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.