Dyfyniad APA

Rossi, P. H., & Freeman, H. E. (1993). Evaluation: A systematic approach (5th ed.). Sage Pub.

Dyfyniad Arddull Chicago

Rossi, Peter Henry, and Howard E. Freeman. Evaluation: A Systematic Approach. 5th ed. Newbury Park, CA: Sage Pub, 1993.

Dyfyniad MLA

Rossi, Peter Henry, and Howard E. Freeman. Evaluation: A Systematic Approach. 5th ed. Sage Pub, 1993.

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