Zipf, George Kingsley % 1902 <br/><br/>
Human behavior and the principle of least effort : an introd. to human ecology 

 - Cambridge, Mass.,  1949 
<br/><br/> Monografía 
<br/><br/><label>Subjects--Index Terms: </label>Ecología Humana 
<br/><br/><label>LC Class. No.: </label>GF31/Z55