“The Long Century of Papal Schisms.” The Middle Ages, by Johannes Fried and Peter Lewis, Harvard University Press, Cambridge, Massachusetts; London, England, 2015, pp. 167–237. JSTOR, www.jstor.org/stable/j.ctt1287gwp.11. Accessed 8 May 2021.
Fried, J., & Lewis, P. (2015). The Long Century of Papal Schisms. In The Middle Ages (pp. 167-237). Cambridge, Massachusetts; London, England: Harvard University Press. Retrieved May 8, 2021, from http://www.jstor.org/stable/j.ctt1287gwp.11
Fried, Johannes, and Peter Lewis. "The Long Century of Papal Schisms." In The Middle Ages, 167-237. Cambridge, Massachusetts; London, England: Harvard University Press, 2015. Accessed May 8, 2021. http://www.jstor.org/stable/j.ctt1287gwp.11.
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