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Baris 41: == 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=~~Head~~Davidson \| first=~~Tom (ed.)~~Keay \| ~~coauthors~~pages=33–41 \| location=~~Jackson,~~New ~~Mississippi~~York \| publisher=~~University~~John ~~Press~~Wiley of& ~~Mississippi~~Sons \| year=~~2005~~1999 \| isbn=~~1578067367~~0471252867}} * {{Cite book \| title=Conversations with Carl Sagan~~: A Life in the Cosmos~~ \| last=~~Poundstone~~Head \| first=~~William~~Tom (ed.) \|coauthors= \|location=~~New~~Jackson, ~~York~~Mississippi \| publisher=~~Henry~~University ~~Holt~~Press &of ~~Company~~Mississippi \| year=~~1999~~2005 \| isbn=~~0805057668~~1578067367}} ▲* {{Cite book \| title=Carl Sagan: A Life \|in the Cosmos \|last=~~Davidson~~Poundstone \| first=~~Keay~~William \| ~~pages=33–41 \|~~ location=New York \| publisher=~~John~~Henry ~~Wiley~~Holt & ~~Sons~~Company \| year=1999 \| isbn=~~0471252867~~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.}}

Carl Sagan: Perbedaan antara revisi