Blake, Barry J. <br/><br/>
Secret language / 
Barry J. Blake 
 - Oxford :  Oxford University Press,  2010 
 - xi, 328 p. :  ill. ;  20 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780199691623 (pbk.) 9780199579280 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Historical linguistics<br/>Ciphers<br/>Cryptography