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 Popes
Baumgartner, 2003, pp. 206–208. Greeley, Andrew M. 2005. The Making of the Pope: 2005. Brown, Little. ISBN 0-316-86149-9. TODAY, Eric J. Lyman, Special for
sculpture, 1140–1300. pp. 95–98. Beckwith, John. (1961). "Review: The Tomb of Pope Clement II at Bamberg". The Burlington Magazine, Vol. 103, No. 700, pp. 321–322