Kellstedt, P. M., & Whitten, G. D. (2013). The fundamentals of political science research (Second edition.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Kellstedt, Paul M., agus Guy D. Whitten. The Fundamentals of Political Science Research. Second edition. Cambridge: Cambridge University Press, 2013.
Lua MLA (8ú heag.)Kellstedt, Paul M., agus Guy D. Whitten. The Fundamentals of Political Science Research. Second edition. Cambridge University Press, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.