Παραπομπή σε μορφή APA (7η εκδ.)

Besley, T., & Zagha, R. (2005). Development challenges in the 1990s: Leading policymakers speak from experience. World Bank.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Besley, Timothy, και Roberto Zagha. Development Challenges in the 1990s: Leading Policymakers Speak from Experience. Washington, D.C: World Bank, 2005.

Παραπομπή σε μορφή MLA (9th εκδ.)

Besley, Timothy, και Roberto Zagha. Development Challenges in the 1990s: Leading Policymakers Speak from Experience. World Bank, 2005.