Michael Levy, d. (2008). TECHNOLOGY. Britannica.
Lua i Stíl Chicago (17ú heag.)Michael Levy, dkk. TECHNOLOGY. Britannica, 2008.
Lua MLA (8ú heag.)Michael Levy, dkk. TECHNOLOGY. Britannica, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.