Change 19 

 - Washington  Heldref publication  Jul. / Ago. 1987 
 - 54 
 - 20101007 
 - Change  19 .
<br/><br/><label>ISSN: </label>1679-656X 
<br/><br/><label>Dewey Class. No.: </label>CAG 2010  / 2010