Drucker. Management: Tasks, Responsibilities, Practices. Elsevier.
Lua i Stíl Chicago (17ú heag.)Drucker. Management: Tasks, Responsibilities, Practices. Elsevier.
Lua MLA (9ú heag.)Drucker. Management: Tasks, Responsibilities, Practices. Elsevier.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.