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Sedgwick, Romney R. (1970). R. Sedgwick (ed.). "BELL, Ralph (d.1733), of Sowerby, Thirsk, Yorks". The History of Parliament: the House of Commons 1715–1754. Boydell and Brewer. Archived from the original on 24 October 2015. Retrieved 30 June 2014.
ik.org
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"RC School". Archived from the original on 13 August 2013. Retrieved 27 January 2013.
Page, William, ed. (1923). "Parishes: Thirsk". Victoria County History: A History of the County of York North Riding: Volume 2. Institute of Historical Research. Archived from the original on 7 February 2013. Retrieved 14 February 2013.
Sedgwick, Romney R. (1970). R. Sedgwick (ed.). "BELL, Ralph (d.1733), of Sowerby, Thirsk, Yorks". The History of Parliament: the House of Commons 1715–1754. Boydell and Brewer. Archived from the original on 24 October 2015. Retrieved 30 June 2014.