Frederick R. Chromey. (2012). To Measure the Sky (1.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Frederick R. Chromey. To Measure the Sky. 1. Cambridge University Press, 2012.
Lua MLA (8ú heag.)Frederick R. Chromey. To Measure the Sky. 1. Cambridge University Press, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.