Carl Sagan: Perbedaan antara revisi
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== Sumber buku ==
* {{Cite book
* {{Cite book
* {{Cite book
* {{Cite journal|last=Morrison |first=David |year=2006 |title=Carl Sagan: The People's Astronomer |work=AmeriQuests |volume=3 |issue=2 |url=http://ejournals.library.vanderbilt.edu/ameriquests/include/getdoc.php?id=402&article=93&mode=pdf |format=PDF}}
* {{Cite book|last=Achenbach
== Pranala luar ==
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