Mohr, L. B. (1995). Impact analysis for program evaluation (2nd ed.). Sage Publications.
Dyfyniad Arddull ChicagoMohr, Lawrence B. Impact Analysis for Program Evaluation. 2nd ed. Thousand Oaks, Calif.: Sage Publications, 1995.
Dyfyniad MLAMohr, Lawrence B. Impact Analysis for Program Evaluation. 2nd ed. Sage Publications, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.