Sommer, Barbara <br/><br/>
Practical guide to behavioral research: tools and techniques 

 - 4th 
 - New York  Oxford University Press  1997 
 - xviii,376p p. 
<br/><br/><label>ISBN: </label>0-19-510419-6 
<br/><br/><label>Subjects--Index Terms: </label>Social sciences - Research