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

 - Boston  Cengage Learning  2016 
 - xxii, 422p.; ills 
<br/><br/><label>ISBN: </label>9781133954774 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research methods
<br/><br/><label>Dewey Class. No.: </label>001.42  / TRO