United States. National Aeronautics and Space Administration. Astrophysics Performance Assessment Committee & ebrary, Inc. (2007). A performance assessment of NASA's Astrophysics Program. National Research Council.
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Dyfyniad Arddull Chicago
United States. National Aeronautics and Space Administration. Astrophysics Performance Assessment Committee and Inc ebrary. A Performance Assessment of NASA's Astrophysics Program. Washington, D.C.: National Research Council, 2007.
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Dyfyniad MLA
United States. National Aeronautics and Space Administration. Astrophysics Performance Assessment Committee and Inc ebrary. A Performance Assessment of NASA's Astrophysics Program. National Research Council, 2007.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.