Barnes, W. Earth Observing Systems IX. SPIE Digital Library.
Lua i Stíl Chicago (17ú heag.)Barnes, William. Earth Observing Systems IX. SPIE Digital Library.
Lua MLA (9ú heag.)Barnes, William. Earth Observing Systems IX. SPIE Digital Library.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.