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Van Brummelen, G. (2017-04-04). Areas, Angles, and Polyhedra. In Heavenly Mathematics: The Forgotten Art of Spherical Trigonometry. : Princeton University Press. Retrieved 6 Apr. 2020, from https://www.universitypressscholarship.com/view/10.23943/princeton/9780691175997.001.0001/upso-9780691175997-chapter-007.
Van Brummelen, Glen. "Areas, Angles, and Polyhedra." Heavenly Mathematics: The Forgotten Art of Spherical Trigonometry. : Princeton University Press,
May 24, 2018. University Press Scholarship Online. Date Accessed 6 Apr. 2020 <https://www.universitypressscholarship.com/view/10.23943/princeton/9780691175997.001.0001/upso-9780691175997-chapter-007>.
Van Brummelen, Glen. "Areas, Angles, and Polyhedra." In Heavenly Mathematics: The Forgotten Art of Spherical Trigonometry. Princeton University Press, 2017. University Press Scholarship Online, 2018. doi: 10.23943/princeton/9780691175997.003.0007.
Van Brummelen G. Areas, Angles, and Polyhedra. In: Heavenly Mathematics: The Forgotten Art of Spherical Trigonometry. Princeton University Press; 2017. https://www.universitypressscholarship.com/view/10.23943/princeton/9780691175997.001.0001/upso-9780691175997-chapter-007. Accessed April 6, 2020.