National Research Council (U.S.). Astronomy and Astrophysics Survey Committee & ebrary, Inc. (2001). Astronomy and astrophysics in the new millennium. National Academy Press.
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Dyfyniad Arddull Chicago
National Research Council (U.S.). Astronomy and Astrophysics Survey Committee and Inc ebrary. Astronomy and Astrophysics in the New Millennium. Washington, D.C.: National Academy Press, 2001.
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Dyfyniad MLA
National Research Council (U.S.). Astronomy and Astrophysics Survey Committee and Inc ebrary. Astronomy and Astrophysics in the New Millennium. National Academy Press, 2001.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.