Palen, S. 1. (2012). Understanding our universe. New York, NY: W.W. Norton.
Trích dẫn kiểu ChicagoPalen, Stacy. 1957-. Understanding Our Universe. New York, NY: W.W. Norton, 2012.
MLA citiranjePalen, Stacy. 1957-. Understanding Our Universe. New York, NY: W.W. Norton, 2012.
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