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Canfield, D. (2014-01-19). Life before Oxygen. In Oxygen: A Four Billion Year History. : Princeton University Press. Retrieved 1 Jul. 2022, from https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691145020.001.0001/upso-9780691145020-chapter-2.
Canfield, Donald Eugene. "Life before Oxygen." Oxygen: A Four Billion Year History. : Princeton University Press,
19. Princeton Scholarship Online. Date Accessed 1 Jul. 2022 <https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691145020.001.0001/upso-9780691145020-chapter-2>.
Canfield, Donald Eugene. "Life before Oxygen." In Oxygen: A Four Billion Year History. Princeton University Press, 2014. Princeton Scholarship Online, 2017. doi: 10.23943/princeton/9780691145020.003.0002.
Canfield DE. Life before Oxygen. In: Oxygen: A Four Billion Year History. Princeton University Press; 2014. https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691145020.001.0001/upso-9780691145020-chapter-2. Accessed July 1, 2022.