Change 19 

 - Washington  Heldref publication  Mai. / Jun. 1987 
 - 62 
 - 20101008 
 - Change  19 .
<br/><br/><label>ISSN: </label>1679-656X 
<br/><br/><label>Dewey Class. No.: </label>CAG 2010  / 2010