Rabenstein, Katherine (June 1998). "Adulf (Adolph, Adulph), B(?)". Saints O' the Day for June 17. Archived from the original on 27 February 2007. Retrieved 26 February 2012.
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Rabenstein, Katherine (June 1998). "Adulf (Adolph, Adulph), B(?)". Saints O' the Day for June 17. Archived from the original on 27 February 2007. Retrieved 26 February 2012.