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Davidson, K.  (2000, June). Sagan, Carl (1934-1996), space scientist, author, science popularizer, TV personality, and antinuclear weapons activist. American National Biography. Retrieved 22 Oct. 2019, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1302612.