Gymnosperms 
Bhatnagar S. P., Moitra, Alok 
 - New Delhi  New International Publishers  1996 
 - vi,470 p.  :ill. 
<br/><br/><label>ISBN: </label>9788122407921 
<br/><br/><label>LC Class. No.: </label>QK494.  / 43 1996