Marx, S., & Pfau, W. (1982). Observatories of the world. Blandford.
Lua i Stíl Chicago (17ú heag.)Marx, Siegfried, agus Werner Pfau. Observatories of the World. Poole: Blandford, 1982.
Lua MLA (8ú heag.)Marx, Siegfried, agus Werner Pfau. Observatories of the World. Blandford, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.