Pennings, P. (2006). Doing research in political science (2nd ed.). Sage.
芝加哥风格引文Pennings, Paul. Doing Research in Political Science. 2nd ed. London ; Thousand Oaks, Calif: Sage, 2006.
MLA引文Pennings, Paul. Doing Research in Political Science. 2nd ed. Sage, 2006.
警告：这些引文格式不一定是100％准确.