APA (7th ed.) Zitazioa
Gertler, P. J. (2011). Impact evaluation in practice. The World Bank.
Chicago Style (17th ed.) Zitazioa
Gertler, Paul J. Impact Evaluation in Practice. Washington: The World Bank, 2011.
MLA (9th ed.) Zitazioa
Gertler, Paul J. Impact Evaluation in Practice. The World Bank, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.