Hodgson, Geoffrey M. (2008): , andre utgave, Standon, Hertfordshire: Martlet Books. Wainwright, F. T. (1975): , Chichester: Phillimore. Winchester, Angus J. L. (1985): «The Multiple Estate: A Framework for the Evolution of Settlement in Anglo-Saxon and Scandinavian Cumbria» i: Baldwin, John R. & Whyte, Ian D., red. (1985): , Edinburgh: The Scottish Society for Northern Studies, s. 89–101.