Dyfyniad APA

Rossi, P. H., Freeman, H., & Lipsey, M. W. (2004). Evaluation: A systematic approach (7th ed.). Sage Publications.

Dyfyniad Arddull Chicago

Rossi, Peter H., Howard Freeman, and Mark W. Lipsey. Evaluation: A Systematic Approach. 7th ed. Thousand Oaks, California: Sage Publications, 2004.

Dyfyniad MLA

Rossi, Peter H., et al. Evaluation: A Systematic Approach. 7th ed. Sage Publications, 2004.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.