Nickels, W. G. (1987). Understanding business (4th ed.). Times Mirror.
Lua i Stíl Chicago (17ú heag.)Nickels, William G. Understanding Business. 4th ed. Toronto: Times Mirror, 1987.
Lua MLA (9ú heag.)Nickels, William G. Understanding Business. 4th ed. Times Mirror, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.