Lehmann Irvin J. Ed. <br/><br/>
Educational research: Readings in focus 

 - 2 
 - New York, USA  Holt, Rinehart and Winston  1979 
 - xii,433p. 
<br/><br/><label>Source: </label>Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research Methods