Fix, J. D. (1999). Astronomy: Journey to the cosmic frontier. WCB/McGraw-Hill.
Trích dẫn kiểu ChicagoFix, John D. Astronomy: Journey to the Cosmic Frontier. WCB/McGraw-Hill, 1999.
MLA CitationFix, John D. Astronomy: Journey to the Cosmic Frontier. WCB/McGraw-Hill, 1999.
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