Trochim, William M. <br/><br/>
Research methods : the essential knowledge base 

 - Boston, Massachusetts    Cengage Learning  2016 
 - xxii, 422 p.  Includes index and references 
<br/><br/><label>ISBN: </label>978-1-133-95477-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research - Methodology
<br/><br/><label>Dewey Class. No.: </label>SHS 001.42 T74r