APA (7th ed.) Zitazioa

World Bank, ebrary, Inc, & Gertler, P. (2011). Impact evaluation in practice. World Bank.

Chicago Style (17th ed.) Zitazioa

World Bank, Inc ebrary, eta Paul Gertler. Impact Evaluation in Practice. Washington, D.C.: World Bank, 2011.

MLA (9th ed.) Zitazioa

World Bank, et al. Impact Evaluation in Practice. World Bank, 2011.