Cita APA (7th ed.)

Levitan, S. A., & Wurzburg, G. K. (1979). Evaluating Federal social programs: An uncertain art. W.E. Upjohn Institute for Employment Research.

Cita Chicago (17th ed.)

Levitan, Sar A., i Gregory K. Wurzburg. Evaluating Federal Social Programs: An Uncertain Art. Kalamazoo, Mich: W.E. Upjohn Institute for Employment Research, 1979.

Cita MLA (9th ed.)

Levitan, Sar A., i Gregory K. Wurzburg. Evaluating Federal Social Programs: An Uncertain Art. W.E. Upjohn Institute for Employment Research, 1979.