Vaughan-Nichols, Steven J. (February 6, 2020). "How the Iowa caucus app went wrong and how open source could have helped". ZDNet websiteArchived February 8, 2020, at the Wayback Machine Retrieved February 8, 2020.
Redlawsk, David; Tolbert, Caroline J.; Donovan, Todd (2011). Why Iowa? : how caucuses and sequential elections improve the presidential nominating process. Chicago: University of Chicago Press. p. 48. ISBN9780226706955. OCLC606053997.
Larimer, Christopher W. (Christopher Wesley). Gubernatorial stability in Iowa : a stranglehold on power. ISBN978-1-137-52814-8. OCLC934936718.
Vaughan-Nichols, Steven J. (February 6, 2020). "How the Iowa caucus app went wrong and how open source could have helped". ZDNet websiteArchived February 8, 2020, at the Wayback Machine Retrieved February 8, 2020.