Epstein, L. D., Fainsod, M., Garceau, O., Leiserson, A., Lockard, D., Pennock, J. R., . . . Watkins, F. M. (1968). Political research and political theory. Harvard University Press.
Lua i Stíl Chicago (17ú heag.)Epstein, Leon D., et al. Political Research and Political Theory. Cambridge, Mass: Harvard University Press, 1968.
Lua MLA (9ú heag.)Epstein, Leon D., et al. Political Research and Political Theory. Harvard University Press, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.