Bethell G. George & Aspinall T. Tricia. (2005). Test your Business Vocabulary in Use. Cambridge, Cambridge University Press, 2005.
Lua i Stíl Chicago (17ú heag.)Bethell G. George agus Aspinall T. Tricia. Test Your Business Vocabulary in Use. Cambridge, Cambridge University Press, 2005, 2005.
Lua MLA (9ú heag.)Bethell G. George agus Aspinall T. Tricia. Test Your Business Vocabulary in Use. Cambridge, Cambridge University Press, 2005, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.