Abert,James G. (1979). Program evaluation at HEW: Research versus reality. Marcel Dekker.
Chicago Style aipamenaAbert,James G. Program Evaluation at HEW: Research Versus Reality. New York: Marcel Dekker, 1979.
MLA aipamenaAbert,James G. Program Evaluation at HEW: Research Versus Reality. Marcel Dekker, 1979.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.