Gall, Meredith D. <br/><br/>
Educational Research  an introduction 
Meredith D. Gall ; Joyce P. Gall ; Walter R. Borg 
 - 8. Aufl. 
 - XXIX, 672 S. : graph. Darst. 
<br/><br/><label>ISBN: </label>978-0205503452  47,99 0-205-50345-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bildungsforschung
<br/><br/><label>Subjects--Geographic Terms: </label><br/>USA