Carl Sagan: Perbedaan antara revisi

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* {{Cite book |title=Carl Sagan: A Life |last=Davidson |first=Keay |pages=33–41 |location=New York |publisher=John Wiley & Sons |year=1999 |isbn=0471252867}}
* {{Cite book |title=Conversations with Carl Sagan |last=Head |first=Tom (ed.) |coauthors= |location=Jackson, Mississippi |publisher=University Press of Mississippi |year=2005 |isbn=1578067367}}
* {{Cite book |title=Carl Sagan: A Life in the Cosmos |last=Poundstone |first=William |location=New York |publisher=Henry Holt & Company |year=1999 |isbn=0805057668}}
* {{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 |first=Joel |year=1999 |title=Captured by Aliens: the search for life and truth in a very large universe |location=New York |publisher=Simon & Schuster |isbn=0-684-84856-2 |laysummary=Includes detailed account of Sagan's role in the search for extraterrestrial life.}}
 
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