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NASA, . (2018, February 15). Schirra, Wally (12 Mar. 1923–3 May 2007). American National Biography. Retrieved 9 Mar. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-SCHIRRA1302694.
NASA, . "Schirra, Wally (12 Mar. 1923–3 May 2007)." American National Biography. February 15, 2018. Oxford University Press. Date of access 9 Mar. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-SCHIRRA1302694>
NASA, . "Schirra, Wally (12 Mar. 1923–3 May 2007)." American National Biography. 15 Feb. 2018; Accessed 9 Mar. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-SCHIRRA1302694.