Davidson, Catherine. <br/><br/>
The directory of signs & signals  a guide to signs, codes and signals from across the world 
Catherine Davidson. 
 - Hoo, Rochester  Grange  2004. 
 - 208 p.  ill.  22cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>1840137142 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sign language.<br/>Signs and symbols.<br/>Visual communication.