مليارات ومليارات (Arabic Wikipedia)

Analysis of information sources in references of the Wikipedia article "مليارات ومليارات" in Arabic language version.

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archive.org

  • Sagan, Carl (1997). Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium. راندوم هاوس. ISBN:0-679-41160-7. مؤرشف من الأصل في 2020-09-05.

skepticalinquirer.org

web.archive.org

  • Sagan, Carl (1997). Billions and Billions: Thoughts on Life and Death at the Brink of the Millennium. راندوم هاوس. ISBN:0-679-41160-7. مؤرشف من الأصل في 2020-09-05.
  • Carl Sagan takes questions more from his 'Wonder and Skepticism' CSICOP 1994 keynote, Skeptical Inquirer نسخة محفوظة December 21, 2016, على موقع واي باك مشين.