Sapsford, Roger <br/><br/>
Survey research 

 - London  SAGE  1999 
 - 258p. 
<br/><br/>  Book 
<br/><br/><br/>Eng. 
<br/><br/><label>ISBN: </label>0761955275  0761955283 (pbk) 
<br/><br/><label>National Library of Medicine Call No.: </label>WA 20.5