APA

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

Chicago

Levitan Sar A, Wurzburg Gregory K, . 1979. Evaluating Federal social programs: an uncertain art. Kalamazoo, Mich: W.E. Upjohn Institute for Employment Research.

Harvard

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

MLA

Levitan Sar A, Wurzburg Gregory K, . Evaluating Federal social programs: an uncertain art. Kalamazoo, Mich: W.E. Upjohn Institute for Employment Research. 1979.