Litka, M. P. (1983). Business law (3ª ed.). John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)Litka, Michael P. Business Law. 3ª ed. John Wiley and Sons, 1983.
Lua MLA (9ú heag.)Litka, Michael P. Business Law. 3ª ed. John Wiley and Sons, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.