Dillman, Don A. <br/><br/>
Mail and internet surveys :  the tailored desig method / 
Don A. Dillman 
 - 2 
 - New York :  John Wiley y Sons, Inc.,  2000       
 - xvi, 464 p. 
<br/><br/><label>ISBN: </label>0471323543 
<br/><br/><label>LC Class. No.: </label>HM 538 D578m 2000