Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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