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Cooper, K.  (2014, January 09). Markus, Robert Austin (1924–2010), historian and philosopher. Oxford Dictionary of National Biography. Retrieved 22 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-103000.

Cooper, Kate. "Markus, Robert Austin (1924–2010), historian and philosopher." Oxford Dictionary of National Biography.  January 09, 2014. Oxford University Press. Date of access 22 Apr. 2021, <https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-103000>

Cooper, Kate. "Markus, Robert Austin (1924–2010), historian and philosopher." Oxford Dictionary of National Biography. 9 Jan. 2014; Accessed 22 Apr. 2021. https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-103000.