Pawson, R., & Tilley, N. (1997). Realistic evaluation. Sage.
Chicago Style aipamenaPawson, Ray, and Nick Tilley. Realistic Evaluation. London: Sage, 1997.
MLA aipamenaPawson, Ray, and Nick Tilley. Realistic Evaluation. Sage, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.