APA (7th ed.) Citation

Collier, P., Hoeffler, A., & Söderbom, M. (2001). On the Duration of Civil War. World Bank.

Chicago Style (17th ed.) Citation

Collier, P., A. Hoeffler, and M. Söderbom. On the Duration of Civil War. World Bank, 2001.

MLA (9th ed.) Citation

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