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Callahan, R.  (2004, September 23). Tiwana, Sir (Muhammad) Umar Hayat, nawab (1874–1944), landowner and army officer. Oxford Dictionary of National Biography. Retrieved 22 Jan. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-36527.

Callahan, Raymond. "Tiwana, Sir (Muhammad) Umar Hayat, nawab (1874–1944), landowner and army officer." Oxford Dictionary of National Biography.  September 23, 2004. Oxford University Press. Date of access 22 Jan. 2021, <https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-36527>

Callahan, Raymond. "Tiwana, Sir (Muhammad) Umar Hayat, nawab (1874–1944), landowner and army officer." Oxford Dictionary of National Biography. 23 Sep. 2004; Accessed 22 Jan. 2021. https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-36527.