Loffel, E. W. (1977). Protecting your business. D. McKay.
Lua i Stíl Chicago (17ú heag.)Loffel, Egon W. Protecting Your Business. New York: D. McKay, 1977.
Lua MLA (9ú heag.)Loffel, Egon W. Protecting Your Business. D. McKay, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.