Margaret Albright Knittl, "The design for the initial drainage of the Great Level of the Fens: an historical whodunit in three parts", Agricultural History Review, 55:1 (2007), pp. 23–50. AbstractArchived 21 July 2011 at the Wayback Machine
le.ac.uk
"ULAS – Thorney". University of Leicester Archaeological Services. 26 February 2007. Archived from the original on 18 December 2014. Retrieved 17 March 2011.
"ULAS – Thorney". University of Leicester Archaeological Services. 26 February 2007. Archived from the original on 18 December 2014. Retrieved 17 March 2011.
Margaret Albright Knittl, "The design for the initial drainage of the Great Level of the Fens: an historical whodunit in three parts", Agricultural History Review, 55:1 (2007), pp. 23–50. AbstractArchived 21 July 2011 at the Wayback Machine