DRUCKER P.F. (1969). AGE OF DISCONTINUITY. PAN BOOKS LTD.
Lua i Stíl Chicago (17ú heag.)DRUCKER P.F. AGE OF DISCONTINUITY. LONDON: PAN BOOKS LTD, 1969.
Lua MLA (9ú heag.)DRUCKER P.F. AGE OF DISCONTINUITY. PAN BOOKS LTD, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.