Grego, P. (2008). Venus and Mercury, and how to observe them. Springer.
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Dyfyniad Arddull Chicago
Grego, Peter. Venus and Mercury, and How to Observe Them. New York: Springer, 2008.
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Dyfyniad MLA
Grego, Peter. Venus and Mercury, and How to Observe Them. Springer, 2008.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.