APA (7th ed.) Citation

Collier, P., Hoeffler, A., & Seoderbom, M. (2001). On the duration of civil war. World Bank.

Chicago Style (17th ed.) Citation

Collier, Paul, Anke Hoeffler, and Means Seoderbom. On the Duration of Civil War. Washington, D.C: World Bank, 2001.

MLA (9th ed.) Citation

Collier, Paul, et al. On the Duration of Civil War. World Bank, 2001.