Alkin, Marvin C. <br/><br/>
Encyclopedia of educational research.  Volume 3  Magn to rura / 
edited by Marvin C. Alkin. 
 - Sixth edition. 
 - New York :  Macmillan ;  c1992. 
 - [763-1123] pages :  illustrations, maps ;  29 cm 
<br/><br/>Includes bibliographical references and index.