"Carl Sagan" pán-pún chi-kan bô-kāng--ê tē-hng
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==Tsù-kái==
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==Guā-pōo liân-kiat==
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* {{Official website|http://www.carlsagan.com/|name=The Carl Sagan Portal}}
* [http://www.nasonline.org/publications/biographical-memoirs/memoir-pdfs/sagan-carl.pdf David Morrison, "Carl Sagan", Biographical Memoirs of the National Academy of Sciences (2014)]
*[https://www.youtube.com/watch?v=PQ4qBBWv3b4 Sagan interviewed by Ted Turner], ''CNN'', 1989, video: 44 minutes.
* [https://www.bbc.co.uk/iplayer/episode/b00scvqk/Great_Lives_Series_21_Carl_Sagan/ BBC Radio program "Great Lives" on Carl Sagan's life]
* [https://books.google.com/books?id=HoZdcomupUQC&pg=PA36 "A man whose time has come"]—Interview with Carl Sagan by [[Ian Ridpath]], ''[[New Scientist]]'', July 4, 1974
* {{IMDb name|755981|Carl Sagan}}
* {{worldcat id|id=lccn-n79-64998}}
* [https://web.archive.org/web/20160201115954/http://www.csicop.org/si/show/carl_sagans_life_and_legacy_as_scientist_teacher_and_skeptic "Carl Sagan's Life and Legacy as Scientist, Teacher, and Skeptic"], by David Morrison, [[Committee for Skeptical Inquiry]]
* [https://vault.fbi.gov/Carl%20Sagan FBI Records: The Vault – Carl Sagan] at fbi.gov
* [https://archive.org/details/NASA_NTRS_Archive_19630011050 "NASA Technical Reports Server (NTRS) 19630011050: Direct Contact Among Galactic Civilizations by Relativistic Interstellar Spaceflight"], Carl Sagan, when he was at Stanford University, in 1962, produced a controversial paper funded by a NASA research grant that concludes ancient alien intervention may have sparked human civilization.
* [https://www.lindahall.org/carl-sagan/ Scientist of the Day-Carl Sagan] at [[Linda Hall Library]]
* Carl Sagan [https://www.youtube.com/watch?v=8hZl3arO7SY demonstrates] how [[Eratosthenes]] determined that the Earth was round and the approximate [[circumference of the earth]]
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