Paleobolany, paleoecology and evolution 
edited by Karl J. Niklas. 
 - New York  Praeger Publishers  1981 
 - (V.2.). 
<br/><br/><label>ISBN: </label>0-03-056656-8. 
<br/><br/><label>Dewey Class. No.: </label>560.45  / P13P