United Nations. (1972). Guidelines for project evaluation. Oxford & IBH publishing co pvt ltd.
Chicago Style aipamenaUnited Nations. Guidelines for Project Evaluation. New Delhi: Oxford & IBH publishing co pvt ltd, 1972.
MLA aipamenaUnited Nations. Guidelines for Project Evaluation. Oxford & IBH publishing co pvt ltd, 1972.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.