Walter, M., <br/><br/>
Encyclopaedia of Internet & Web, Volume-2 ( F-M ) 

 - Delhi :  IVY Publishing House,  c2002. 
 - 238-514 p.:  [5E] 
<br/><br/><label>ISBN: </label>8178900432 
<br/><br/><label>Dewey Class. No.: </label>004.678 03  / WAL/ENC