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Neuman, J.  (2020, August 27). Mackay, Katherine Alexander Duer (9 May 1879–19 Apr. 1930), suffragist and writer. American National Biography. Retrieved 12 Apr. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-369355.

Neuman, Johanna. "Mackay, Katherine Alexander Duer (9 May 1879–19 Apr. 1930), suffragist and writer." American National Biography.  August 27, 2020. Oxford University Press. Date of access 12 Apr. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-369355>

Neuman, Johanna. "Mackay, Katherine Alexander Duer (9 May 1879–19 Apr. 1930), suffragist and writer." American National Biography. 27 Aug. 2020; Accessed 12 Apr. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-369355.