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Oreskes, N., & Conway, E. (2014-07-01). The Coming of the Penumbral Age. In The Collapse of Western Civilization: A View from the Future. : Columbia University Press. Retrieved 24 May. 2022, from https://columbia.universitypressscholarship.com/view/10.7312/columbia/9780231169547.001.0001/upso-9780231169547-chapter-001.

Oreskes, Naomi, and Erik M. Conway. "The Coming of the Penumbral Age." The Collapse of Western Civilization: A View from the Future. : Columbia University Press,  19. Columbia Scholarship Online. Date Accessed 24 May. 2022 <https://columbia.universitypressscholarship.com/view/10.7312/columbia/9780231169547.001.0001/upso-9780231169547-chapter-001>.

Oreskes, Naomi, and Erik M. Conway. "The Coming of the Penumbral Age." In The Collapse of Western Civilization: A View from the Future, by Oreskes, Naomi, and Erik Conway.. Columbia University Press, 2014. Columbia Scholarship Online, 2015. doi: 10.7312/columbia/9780231169547.003.0001.

Oreskes N, Conway EM. The Coming of the Penumbral Age. In: The Collapse of Western Civilization: A View from the Future. Columbia University Press; 2014. https://columbia.universitypressscholarship.com/view/10.7312/columbia/9780231169547.001.0001/upso-9780231169547-chapter-001. Accessed May 24, 2022.