Gregory, S. <br/><br/>
Statistical methods and the geographer 

 - 4th.ed. 
 - Great Britain  Longman Group Limited  1978 
 - xv,240p. 
<br/><br/><label>ISBN: </label>0 582 48186 4 
<br/><br/><label>Dewey Class. No.: </label>519.5  / G80S