American political interest groups :  readings in theory and research / 
edited by Betty H. Zisk 
 - Belmont, Calif. :  Wadsworth Pub.,  1969 
 - 469 p. ;  24 cm. 
 - Wadsworth Series in American politics .
<br/><br/><label>ISBN: </label> USD 7.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pressure groups--United States
<br/><br/><label>Dewey Class. No.: </label>323.0973