Visible variation : comparative studies on sign language structure 
edited by Pamela M. Perniss, Roland Pfau, Markus Steinbach 
 - Berlin ; New York  Mouton de Gruyter  c2007 
 - x, 403 p. : ill. ; 24 cm 
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9783110195781 
<br/><br/><label>ISSN: </label>2007025689 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Language and languages - Variation<br/>Linguistic change<br/>Psycholinguistics<br/>Sign language
<br/><br/><label>Dewey Class. No.: </label>419 PER