Nickels, W. G. (1987). Understanding business. Times Mirror/Mosby College Pub..
Lua i Stíl Chicago (17ú heag.)Nickels, William G. Understanding Business. St. Louis: Times Mirror/Mosby College Pub., 1987.
Lua MLA (9ú heag.)Nickels, William G. Understanding Business. Times Mirror/Mosby College Pub., 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.