Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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