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Pence, G. Borlaug, Norman Ernest (25 March 1914–12 September 2009). American National Biography. Retrieved 5 Jul. 2022, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1302691.
Pence, Gregory E. "Borlaug, Norman Ernest (25 March 1914–12 September 2009)." American National Biography. . Oxford University Press. Date of access 5 Jul. 2022, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1302691>
Pence, Gregory E. "Borlaug, Norman Ernest (25 March 1914–12 September 2009)." American National Biography. 1 Apr. 2016; Accessed 5 Jul. 2022. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1302691.