Pteridophytes and gymnosperms / 
volume editors: K. U Kramer and P. S. Green 
 - Berlin :  Springer-Verlag,  1990 
 - 404 p. :  ill ;  28 cm. 
 - Families and genera of vascular plants ;  v.1 .
<br/><br/><label>ISBN: </label>0387517944 
<br/><br/><label>LCCN: </label>89-26217 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pteridophyta--Classification<br/>Gymnosperms--Classification