Levitan, S. A., & Wurzburg, G. K. (1979). Evaluating Federal social programs: An uncertain art. W.E. Upjohn Institute for Employment Research.
芝加哥风格引文Levitan, Sar A., 与 Gregory K. Wurzburg. Evaluating Federal Social Programs: An Uncertain Art. Kalamazoo, Mich: W.E. Upjohn Institute for Employment Research, 1979.
MLA引文Levitan, Sar A., 与 Gregory K. Wurzburg. Evaluating Federal Social Programs: An Uncertain Art. W.E. Upjohn Institute for Employment Research, 1979.
警告：这些引文格式不一定是100％准确.