References
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- Barone, M., and C. McCutcheon. 2013. The Almanac of American Politics 2014. Chicago, IL: University of Chicago Press.
- Gerber, A. 1998. “Estimating the Effect of Campaign Spending on Senate Election Outcomes Using Instrumental Variables.” The American Political Science Review 92: 401–411. doi:10.2307/2585672.
- Squire, P. 1992. “Challenger Quality and Voting Behavior in US Senate Elections.” Legislative Studies Quarterly 17: 247–263. doi:10.2307/440060.
- Squire, P., and E. R. A. N. Smith. 1996. “A Further Examination of Challenger Quality in Senate Elections.” Legislative Studies Quarterly 21: 235–248. doi:10.2307/440181.