Sapsford, Roger <br/><br/>
Survey research / 
Roger Sapsford 
 - London :  Sage Publications,  1999 
 - ix, 258 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>0761955275 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Surveys--Research