"Review: The Tomb of Pope Clement II at Bamberg". The Burlington Magazine, Vol. 103, No. 700, pp. 321–322. Turner, Jane. (1996). The dictionary of art. p. 139
Corrections Made to Official List of Popes. ZENIT. 2001-06-05 [2008-10-21]. (原始内容存档于2009-01-19). Papal Primacy of honour: titles and insignia. Newadvent