ISBN 0-8028-2416-1. (原始内容存档于2012-10-11). The fourth pope (页面存档备份,存于互联网档案馆) Discussed in the article on Clement I Mcbrien, Richard P. The Pocket Guide to the
Northridge. 2015-07-04 [2018-01-23]. (原始内容存档于2018-01-23) (英语). Smith, S. PopeClementXIII. The Catholic Encyclopedia. New York: Robert Appleton Company. 1908
(原始内容存档于2017-12-14) (英语). Clarke, Richard Henry. The life of His Holiness Pope Leo XIII ... together with extracts from his pastorals and encyclicals. P. W