Rubinstein, William D.; Jolles, Michael A.; Rubinstein, Hilary L. (2011), Rubinstein, William D.; Jolles, Michael A.; Rubinstein, Hilary L. (eds.), "P", The Palgrave Dictionary of Anglo-Jewish History, London: Palgrave Macmillan UK, pp. 740–774, doi:10.1057/9780230304666_16, ISBN978-0-230-30466-6, retrieved 17 March 2021