Mitchell, Mark L. <br/><br/>
Research design explained / 
Mark L. Mitchell, Janina M. Jolley 
 - 6th ed. 
 - Belmont, CA :  Thomson Wadsworth,  2007 
 - xxiv, 611 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>9780495092230 0495092231 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research