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MLA
SCHOPF, J. WILLIAM. “When Did Life Begin?” Life's Origin: The Beginnings of Biological Evolution, edited by J. William Schopf, 1st ed., University of California Press, Berkeley; Los Angeles; London, 2002, pp. 158–180, www.jstor.org/stable/10.1525/j.ctt1pntj6.9. Accessed 10 Aug. 2020.
APA
SCHOPF, J. (2002). When Did Life Begin? In Schopf J. (Ed.), Life's Origin: The Beginnings of Biological Evolution (pp. 158-180). Berkeley; Los Angeles; London: University of California Press. Retrieved August 10, 2020, from www.jstor.org/stable/10.1525/j.ctt1pntj6.9
CHICAGO
SCHOPF, J. WILLIAM. "When Did Life Begin?" In Life's Origin: The Beginnings of Biological Evolution, edited by Schopf J. William, 158-80. Berkeley; Los Angeles; London: University of California Press, 2002. Accessed August 10, 2020. www.jstor.org/stable/10.1525/j.ctt1pntj6.9.

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