Pandey, S N; et al. <br/><br/>
Textbook of botany, Vol.2: Bryophyta, pteridophyta, gymnosperms and palaeobotany / 
Pandey, S N; et al. 
 - 12 ed. 
 -  Vikas Publishing House Pvt. Ltd.,  2006 
 - p. ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plants; Botany
<br/><br/><label>Dewey Class. No.: </label>580 PAN-T12.2