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Verschuur, G. (1996-10-24). Impact!: The Threat of Comets and Asteroids. : Oxford University Press. Retrieved 29 Jun. 2022, from https://oxford.universitypressscholarship.com/view/10.1093/oso/9780195101058.001.0001/isbn-9780195101058.
Verschuur, Gerrit L. Impact!: The Threat of Comets and Asteroids. : Oxford University Press,
12. Oxford Scholarship Online. Date Accessed 29 Jun. 2022 <https://oxford.universitypressscholarship.com/view/10.1093/oso/9780195101058.001.0001/isbn-9780195101058>.
Verschuur, Gerrit L. Impact!: The Threat of Comets and Asteroids. NY: Oxford University Press, 1996. Oxford Scholarship Online, 2020. doi: 10.1093/oso/9780195101058.001.0001.
Verschuur GL. Impact!: The Threat of Comets and Asteroids. Oxford University Press; 1996. https://oxford.universitypressscholarship.com/view/10.1093/oso/9780195101058.001.0001/isbn-9780195101058. Accessed June 29, 2022.