Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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