Orr, L. L. (1999). Social experiments: Evaluating public programs with experimental methods. Sage.
Cita Chicago (17th ed.)Orr, Larry L. Social Experiments: Evaluating Public Programs with Experimental Methods. Thousand Oaks, Calif: Sage, 1999.
Cita MLA (9th ed.)Orr, Larry L. Social Experiments: Evaluating Public Programs with Experimental Methods. Sage, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.