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Hallam, T. (2004-05-13). Catastrophes and Lesser Calamities: The causes of mass extinctions. : Oxford University Press. Retrieved 7 Mar. 2021, from https://oxford.universitypressscholarship.com/view/10.1093/oso/9780198524977.001.0001/isbn-9780198524977.
Hallam, Tony. Catastrophes and Lesser Calamities: The causes of mass extinctions. : Oxford University Press,
November 12, 2020. Oxford Scholarship Online. Date Accessed 7 Mar. 2021 <https://oxford.universitypressscholarship.com/view/10.1093/oso/9780198524977.001.0001/isbn-9780198524977>.
Hallam, Tony. Catastrophes and Lesser Calamities: The causes of mass extinctions. Oxford: Oxford University Press, 2004. Oxford Scholarship Online, 2020. doi: 10.1093/oso/9780198524977.001.0001.
Hallam T. Catastrophes and Lesser Calamities: The causes of mass extinctions. Oxford University Press; 2004. https://oxford.universitypressscholarship.com/view/10.1093/oso/9780198524977.001.0001/isbn-9780198524977. Accessed March 7, 2021.