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Mieczkowski, Y. (2000, February). Powers, John Robert (1896-1977), modeling agency executive. American National Biography. Retrieved 19 Jan. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1002099.
Mieczkowski, Yanek. "Powers, John Robert (1896-1977), modeling agency executive." American National Biography. February, 2000. Oxford University Press. Date of access 19 Jan. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1002099>
Mieczkowski, Yanek. "Powers, John Robert (1896-1977), modeling agency executive." American National Biography. 1 Feb. 2000; Accessed 19 Jan. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1002099.