Pastor, L., Antrobus, F. I., Kerr, R. F., Graf, E., & Peeler, E. F. (1898). The history of the popes from the close of the Middle Ages: Drawn from the secret archives of the Vatican and other original sources. Herder.

Pastor, Ludwig, Frederick Ignatius Antrobus, Ralph Francis Kerr, Ernest Graf, and E. F. Peeler. The History of the Popes from the Close of the Middle Ages: Drawn from the Secret Archives of the Vatican and Other Original Sources. St. Louis: Herder, 1898.

Pastor, Ludwig, et al. The History of the Popes from the Close of the Middle Ages: Drawn from the Secret Archives of the Vatican and Other Original Sources. Herder, 1898.