Langbein, L. I., & Felbinger, C. L. (2006). Public program evaluation: A statistical guide. M.E. Sharpe.
Lua i Stíl Chicago (17ú heag.)Langbein, Laura Irwin, agus Claire L. Felbinger. Public Program Evaluation: A Statistical Guide. Armonk, N.Y: M.E. Sharpe, 2006.
Lua MLA (9ú heag.)Langbein, Laura Irwin, agus Claire L. Felbinger. Public Program Evaluation: A Statistical Guide. M.E. Sharpe, 2006.
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