Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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