Kay, L., & Palen, S. (2006). 21st century astronomy. New York: Norton & Company.
Čikaški stil citiranjaKay, Laura, i Stacy Palen. 21st Century Astronomy. New York: Norton & Company, 2006.
MLA način citiranjaKay, Laura, i Stacy Palen. 21st Century Astronomy. New York: Norton & Company, 2006.
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