Hecht, E. Optics. Addison-Wesley Publishing.
Lua i Stíl Chicago (17ú heag.)Hecht, Eugene. Optics. Addison-Wesley Publishing.
Lua MLA (8ú heag.)Hecht, Eugene. Optics. Addison-Wesley Publishing.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.