Mohr, Lawrence B. <br/><br/>
Impact analysis for program evaluation / 
Lawrence B. Mohr. 
 - 2nd ed. 
 - xxii, 310 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>0803959354  RM172.86 0803959362 (pbk.)  RM239.59 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Policy sciences.<br/>Evaluation research (Social action programs).