Gravetter, Frederick J <br/><br/>
Essentials of statistics for behavioral sciences 

 - 5 ed. 
 - United States of America  Thomson wadsworth  2005 
 - 486 p. 
<br/><br/><label>ISBN: </label>9780534633967 
<br/><br/><label>Dewey Class. No.: </label>519.5