Posavac, E. J., & Carey, R. G. (1980). Program Evaluation. Prentice-Hall of India.
Chicago Style aipamenaPosavac, Emil J., and Reymond G. Carey. Program Evaluation. New Jersey: Prentice-Hall of India, 1980.
MLA aipamenaPosavac, Emil J., and Reymond G. Carey. Program Evaluation. Prentice-Hall of India, 1980.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.