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Powell, E. N. Crowded Space, Fertile Ground: Party Entry and the Effective Number of Parties,. Political Science Research and Methods, 2015.
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Powell, E. N. Professional Societies, Political Action Committees, and Party Preferences,. American Journal of Public Health, 2015.
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Powell, E. N., and J. Grimmer. Money in Exile: Campaign Contributions and Committee Access. Journal of Politics, 2016.
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Powell, E. N., D. M. Kselman, and J. A. Tucker. Crowded Space, Fertile Ground: Party Entry and the Effective Number of Parties. Vol. 4, no. 2, Political Science Research and Methods, 2016, pp. 317-42.