Silver, Steven H. "Index to the Rolls Series". The ORB: On-line Reference Book for Medieval Studies. Archived from the original on 27 July 2015. Retrieved 27 July 2015.
Silver, Steven H. "Index to the Rolls Series". The ORB: On-line Reference Book for Medieval Studies. Archived from the original on 27 July 2015. Retrieved 27 July 2015.