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Evensen, B.  (2019, February 28). Schirra, Wally (12 Mar. 1923–3 May 2007), astronaut, aeronautical engineer, and television commentator. American National Biography. Retrieved 15 Apr. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1302694.

Evensen, Bruce J. "Schirra, Wally (12 Mar. 1923–3 May 2007), astronaut, aeronautical engineer, and television commentator." American National Biography.  February 28, 2019. Oxford University Press. Date of access 15 Apr. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1302694>

Evensen, Bruce J. "Schirra, Wally (12 Mar. 1923–3 May 2007), astronaut, aeronautical engineer, and television commentator." American National Biography. 28 Feb. 2019; Accessed 15 Apr. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1302694.