Langenbach, Michael. <br/><br/>
An introduction to educational research / 
Michael Langenbach, Courtney Vaughn and Lola Aagaard. 
 - Boston, MA :  Allyn and Bacon,  1994. 
 - 387 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0205139027  RM133.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research.