Drucker, P. (1977). Management cases. Harper College Press.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter. Management Cases. New York: Harper College Press, 1977.
Lua MLA (9ú heag.)Drucker, Peter. Management Cases. Harper College Press, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.