Dunning, Thad <br/><br/>
Natural experiments in the social sciences :  a design-based approach / 
Thad Dunning 
 - Cambridge :  Cambridge University Press,  2012 
 - xix, 358 p. :  ill. ;  26 cm. 
 - Strategies for social inquiry .
<br/><br/>Includes bibliographical references (p. 338-352) and index 
<br/><br/><label>ISBN: </label>9781107017665 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Experiments<br/>Social sciences--Research<br/>Experimental design