Carl Sagan: Perbedaan revisi

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== Sumber buku ==
 
* {{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: A Life | last=HeadDavidson | first=Tom (ed.)Keay | coauthorspages=33–41 | location=Jackson,New MississippiYork | publisher=UniversityJohn PressWiley of& MississippiSons | year=20051999 | isbn=15780673670471252867}}
* {{Cite book | title=Conversations with Carl Sagan: A Life in the Cosmos | last=PoundstoneHead | first=WilliamTom (ed.) |coauthors= |location=NewJackson, YorkMississippi | publisher=HenryUniversity HoltPress &of CompanyMississippi | year=19992005 | isbn=08050576681578067367}}
* {{Cite book | title=Carl Sagan: A Life |in the Cosmos |last=DavidsonPoundstone | first=KeayWilliam | pages=33–41 | location=New York | publisher=JohnHenry WileyHolt & SonsCompany | year=1999 | isbn=04712528670805057668}}
* {{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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