Van Dalen, Deohold B <br/><br/>
Understanding educational research  an introduction 

 - 3rd ed. 
 - New York  McGraw-hill book company  1973 
 - viii, 532 p.; 24cm. 
<br/><br/><label>ISBN: </label>70668825 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education research<br/>Educational research<br/>Educational research methods<br/>Tools of education research