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Burton, J. (2004, September 23). William of York [St William of York, William fitz Herbert] (d. 1154), archbishop of York. Oxford Dictionary of National Biography. Retrieved 28 Feb. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-9606.
Burton, Janet. "William of York [St William of York, William fitz Herbert] (d. 1154), archbishop of York." Oxford Dictionary of National Biography. September 23, 2004. Oxford University Press. Date of access 28 Feb. 2021, <https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-9606>
Burton, Janet. "William of York [St William of York, William fitz Herbert] (d. 1154), archbishop of York." Oxford Dictionary of National Biography. 23 Sep. 2004; Accessed 28 Feb. 2021. https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-9606.