World Book, Inc. <br/><br/>
The Plant World : The World Book Encyclopedia of Science Vol -  V  Textual Documents 

 - Chicago  World Book, Inc.  1989 
 - 158. 
<br/><br/><label>ISBN: </label>0716632128   
<br/><br/><label>Subjects--Index Terms: </label>General 
<br/><br/><label>Dewey Class. No.: </label>000  / WOR