Hagman, Roy S. <br/><br/>
Language, life, and human nature / 
by Roy S. Hagman. 
 - Carbondale [Ill.] :  Linguistic Research,  1982. 
 - 180 p. ;  22 cm. 
 - Current Inquiry into Language, Linguistics, and Human Communication ;  41. .
<br/><br/>Includes bibliographical references. 
<br/><br/>Language and tools--Evolution and technique--The invention of language--Language as convention. 
<br/><br/><label>ISBN: </label>0887830439 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Language and languages.