Nickels, W. G. (2010). Understanding Business (9th.). McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Nickels, William G. Understanding Business. 9th. New Delhi: McGraw Hill, 2010.
Lua MLA (9ú heag.)Nickels, William G. Understanding Business. 9th. McGraw Hill, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.