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Callow, J.  (2007, January 04). Howard [née Shireburne], Mary, duchess of Norfolk (1692–1754), Jacobite sympathizer and landowner. Oxford Dictionary of National Biography. Retrieved 15 Jan. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-73837.

Callow, John. "Howard [née Shireburne], Mary, duchess of Norfolk (1692–1754), Jacobite sympathizer and landowner." Oxford Dictionary of National Biography.  January 04, 2007. Oxford University Press. Date of access 15 Jan. 2021, <https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-73837>

Callow, John. "Howard [née Shireburne], Mary, duchess of Norfolk (1692–1754), Jacobite sympathizer and landowner." Oxford Dictionary of National Biography. 23 Sep. 2004; Accessed 15 Jan. 2021. https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-73837.