Cita APA (7a ed.)

Pennings, P. (2006). Doing research in political science (2nd ed.). Sage.

Cita Chicago Style (17a ed.)

Pennings, Paul. Doing Research in Political Science. 2nd ed. London ; Thousand Oaks, Calif: Sage, 2006.

Cita MLA (9a ed.)

Pennings, Paul. Doing Research in Political Science. 2nd ed. Sage, 2006.