Needle, D. (2009). Business in Context - 4th Ed. Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Needle, David. Business in Context - 4th Ed. London: Cengage Learning, 2009.
Lua MLA (9ú heag.)Needle, David. Business in Context - 4th Ed. Cengage Learning, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.