APA استشهاد

Carey, R. G., & Posavac, E. J. (1989). Program evaluation: Methods and case studies (3.).

استشهاد بنمط شيكاغو

Carey, Raymond G., و Emel J. Posavac. Program Evaluation: Methods and Case Studies. 3. New Jersey, Prentice Hall, 1989.

MLA استشهاد

Carey, Raymond G., و Emel J. Posavac. Program Evaluation: Methods and Case Studies. 3. 1989.