Langbein Laura Irwin. Public Program Evaluation : A Statistical Guide / Laura Langbein With Claire L. Felbinger. - Armonk N.Y. : M.E. Sharpe : 2006. - x, 259 p: ILL. 27cm. - 0 . ENG ISBN: 9780765613677 (Pbk: Alk. Paper) LC Class. No.: H97 LAN 2006