Whitehead, G. (1982). Commerce made simple. Made Simple Books.
Lua i Stíl Chicago (17ú heag.)Whitehead, G.M. Commerce Made Simple. Heinemann: Made Simple Books, 1982.
Lua MLA (9ú heag.)Whitehead, G.M. Commerce Made Simple. Made Simple Books, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.