Saya mau tau Catatan dari Pemilihan Paus 1287–1288

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Darras, J. E., Spalding, M. J., and White, Charles Ignatius. 1898. A General History of the Catholic Church. P. J. Kennedy.

Smith, Philip. 1892. The History of the Christian Church. Harper & Bros.

Walsh, Michael J. 2003. The Conclave: A Sometimes Secret and Occasionally Bloody History of Papal Elections. Rowman & Littlefield. ISBN 1-58051-135-X.