Clarke, D. S. <br/><br/>
Sign levels: language and its evolutionary antecedents 

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 - Dordrecht  Kluwer Academic Publishers  2003 
 - xi, 256p.   
<br/><br/>   
<br/><br/><label>ISBN: </label>1-4020-1650-6 
<br/><br/><label>ISSN: </label>
<br/><br/><label>Subjects--Index Terms: </label>Semiotic- Methodology  Comsigns  Language- Evolution  Sign levels 
<br/><br/><label>Dewey Class. No.: </label>164.02