80. Williamson, Paul. (1998). Gothic sculpture, 1140–1300. pp. 95–98. Beckwith, John. (1961). "Review: The Tomb ofPope Clement II at Bamberg". The Burlington
Florida Times-Union. 27 March 2008 [1 April 2008]. (原始内容存档于1 April 2008). Pope, John. Al Copeland dies in Munich, Germany. The Times-Picayune. 23 March 2008