The World Health Organization <br/><br/>
Guidelines on The Conservation of Medicinal Plants 

 - CH-1196, Gland, Switzerland  The international Union for Conservation of Nature and Natural Resources  1993 
 -  p.50. 
<br/><br/><label>ISBN: </label>2831701368 
<br/><br/><label>Universal Decimal Class. No.: </label>633-88  / DOA