Oriti, R. A., & Starbird, W. B. (1977). Introduction to astronomy. Glencoe.
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Dyfyniad Arddull Chicago
Oriti, Ronald A., and William B. Starbird. Introduction to Astronomy. Encino, Calif.: Glencoe, 1977.
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Dyfyniad MLA
Oriti, Ronald A., and William B. Starbird. Introduction to Astronomy. Glencoe, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.