Pandey S N and others <br/><br/>
Textbook of botany : Bryophyta, pteridophyta, gymnosperms and palaeobotany. Vol. 2 

 - 11th rev 
 - New Delhi, India  Vikas Publishing House Private Limited  2001 
 - xi,644p. 
<br/><br/><br/>RSPEE 
<br/><br/><label>ISBN: </label>0-07-463039-3 
<br/><br/><label>Source: </label>Textual