Bird, J. H.  1923- <br/><br/>
The changing worlds of geography :  a practical guide to concepts and methods / 
James Bird 
 - 2nd ed. 
 - Oxford :  Clarendon Press,  1993 
 - 307 p. :  ill. ;  21 cm. 
<br/><br/>References : p. 257-286 
<br/><br/><label>ISBN: </label>0198741820 
<br/><br/><label>LCCN: </label>92-29463 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography--Methodology