Weisberg, Herbert F <br/><br/>
An introduction to survey research and data analysis / 
Herbert F. Weisberg and Bruce D. Bowen 
 - San Francisco :  W. H. Freeman,  1977 
 - x, 243 p :  ill. ;  24 cm 
<br/><br/> Includes index 
<br/><br/>p. 235-237 
<br/><br/><label>ISBN: </label>0716704854 0716704846  pbk 
<br/><br/><label>LCCN: </label>76-39975 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social surveys<br/>Social sciences--Statistical methods