Judd, Charles and  Kenny , David A. <br/><br/>
Estimating the effects of social interventions 

 - Cambridge  Cambridge university press  1981 
 - 243 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1. social science research-- Unites states 2. Evaluation research( social action programs)-- United states.
<br/><br/><label>LC Class. No.: </label>H 62.5 .U5J83 1981