APA (7th ed.) Citation

Pastor, L. v., Antrobus, F. I., & Kerr, R. F. (1899). The history of the popes: From the close of the middle ages. Drawn from the secret archives of the Vatican and other original sources. Kegan Paul.

Chicago Style (17th ed.) Citation

Pastor, Ludwig von, Frederick Ignatius Antrobus, and Ralph Francis Kerr. The History of the Popes: From the Close of the Middle Ages. Drawn from the Secret Archives of the Vatican and Other Original Sources. London: Kegan Paul, 1899.

MLA (9th ed.) Citation

Pastor, Ludwig von, 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. Kegan Paul, 1899.

Warning: These citations may not always be 100% accurate.