Grego, P. (2008). Venus and Mercury, and how to observe them. Springer.
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Chicago-čujuhus (17. p.)
Grego, Peter. Venus and Mercury, and How to Observe Them. New York: Springer, 2008.
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MLA-čujuhus (9. p.)
Grego, Peter. Venus and Mercury, and How to Observe Them. Springer, 2008.
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