Access denied : the practice and policy of global Internet filtering 

 - Cambridge, Mass:  MIT Press,  2008 
 - xv, 449 p. : ill., maps ; 23 cm 
<br/><br/><label>ISBN: </label>9780262541961 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computers - Access control
<br/><br/><label>Dewey Class. No.: </label>005.8 DEI