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Marc, D. (2009, April). Southwick, Alfred Porter (1826-1898), mechanic, dentist, and proponent of the electric chair as a means of administering the death penalty. American National Biography. Retrieved 17 Apr. 2021, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-2001919.
Marc, David. "Southwick, Alfred Porter (1826-1898), mechanic, dentist, and proponent of the electric chair as a means of administering the death penalty." American National Biography. April, 2009. Oxford University Press. Date of access 17 Apr. 2021, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-2001919>
Marc, David. "Southwick, Alfred Porter (1826-1898), mechanic, dentist, and proponent of the electric chair as a means of administering the death penalty." American National Biography. 1 Apr. 2009; Accessed 17 Apr. 2021. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-2001919.