Witzel. History Of Management Thought. routledg.
Lua i Stíl Chicago (17ú heag.)Witzel. History Of Management Thought. routledg.
Lua MLA (9ú heag.)Witzel. History Of Management Thought. routledg.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.