Page, William, 'Houses of the Gilbertine order: The priory of Sempringham', A History of the County of Lincoln: Volume 2 (1906), pp. 179–187, (Public domain text), accessed via British History online
One or more of the preceding sentences incorporates text from a publication now in the public domain: Butler, Richard Urban (1909). "Order of Gilbertines". In Herbermann, Charles (ed.). Catholic Encyclopedia. Vol. 6. New York: Robert Appleton Company.