Engelbert, P. (1997). Astronomy and Space: From the Big Bang to the Big Crunch. U. X. L.
Čikaški stil citiranjaEngelbert, Phillis. Astronomy and Space: From the Big Bang to the Big Crunch. New York: U. X. L, 1997.
MLA način citiranjaEngelbert, Phillis. Astronomy and Space: From the Big Bang to the Big Crunch. U. X. L, 1997.
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