Keller, Rudi  <br/><br/>
On language change:  the invisible hand in language / 
Rudi Keller ; translated by Brigitte Nerlich. 
 - London:  Routledge,  1994. 
 - xi, 182 :  illustrations ;  23 cm. 
<br/><br/>p. 170-177. 
<br/><br/><label>ISBN: </label>0415076714  RM144.27 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Linguistic change.