National Optical Astronomy Observatory (U.S.), Astronomical Society of the Pacific, & American Astronomical Society. (2001). Astronomy education review. National Optical Astronomy Observatory.
Citace podle Chicago (17th ed.)National Optical Astronomy Observatory (U.S.), Astronomical Society of the Pacific, a American Astronomical Society. Astronomy Education Review. Tucson, AZ: National Optical Astronomy Observatory, 2001.
Citace podle MLA (9th ed.)National Optical Astronomy Observatory (U.S.), et al. Astronomy Education Review. National Optical Astronomy Observatory, 2001.
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