U.S. Air Force, Cambridge Research Center. Air Force Surveys in Geophysics. Geophysics Research Directorate.
Lua i Stíl Chicago (17ú heag.)U.S. Air Force, Cambridge Research Center. Air Force Surveys in Geophysics. Bedford, Mass: Geophysics Research Directorate.
Lua MLA (8ú heag.)U.S. Air Force, Cambridge Research Center. Air Force Surveys in Geophysics. Geophysics Research Directorate.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.