National Optical Astronomy Observatory (U.S.), Astronomical Society of the Pacific, & American Astronomical Society. (2001). Astronomy education review. National Optical Astronomy Observatory.
Chicago-referens (17:e uppl.)National Optical Astronomy Observatory (U.S.), Astronomical Society of the Pacific, och American Astronomical Society. Astronomy Education Review. Tucson, AZ: National Optical Astronomy Observatory, 2001.
MLA-referens (9:e uppl.)National Optical Astronomy Observatory (U.S.), et al. Astronomy Education Review. National Optical Astronomy Observatory, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.