Dyfyniad APA

.Posavac, E. J., & .Carey, R. G. (1985). Program evaluation: Methods and case studies (2nd ed.). Prentice-Hall.

Dyfyniad Arddull Chicago

.Posavac, Emil J., and Raymond G. .Carey. Program Evaluation: Methods and Case Studies. 2nd ed. .Englewood Cliffs, N.J: Prentice-Hall, 1985.

Dyfyniad MLA

.Posavac, Emil J., and Raymond G. .Carey. Program Evaluation: Methods and Case Studies. 2nd ed. Prentice-Hall, 1985.

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