David,  Dooley.- <br/><br/>
social research methods/ 
David,  Doleey.- 
 - U.S.A:  Prentice-Hall publishers,  1995. 
 - x,387p.;ill.  includes; bibliographical references and indexes.  23cm. 
<br/><br/><label>ISBN: </label>8120311337 
<br/><br/><label>Dewey Class. No.: </label>300.1 DOO