Collier, P., Hoeffler, A., & Söderbom, M. (2001). On the Duration of Civil War. World Bank.
芝加哥风格引文Collier, P., A. Hoeffler, 与 M. Söderbom. On the Duration of Civil War. World Bank, 2001.
MLA引文Collier, P., et al. On the Duration of Civil War. World Bank, 2001.
警告：这些引文格式不一定是100％准确.