Drucker, P. F. (2008). Managing in a time of great change. Jaico Publishing House.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter F. Managing in a Time of Great Change. Ahmedabad: Jaico Publishing House, 2008.
Lua MLA (9ú heag.)Drucker, Peter F. Managing in a Time of Great Change. Jaico Publishing House, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.