^ a bElections (PDF). p. 637. Retrieved May 10, 2020. {{cite book}}: |work= ignored (help)
^"SD Governor, 1970 - R Primary". Our Campaigns. Retrieved May 10, 2020.
^Congressional Quarterly 1998, p. 79.
^America Votes 9, p. 308.
^"SD Governor, 1970". Our Campaigns. Retrieved May 10, 2020.
Bibliography
Gubernatorial Elections, 1787-1997. Washington, D.C.: Congressional Quarterly Inc. 1998. ISBN1-56802-396-0.
Scammon, Richard M., ed. (1972). America Votes 9: a handbook of contemporary American election statistics, 1970. Washington, D.C.: Governmental Affairs Institute.