Royal Horticultural society. <br/><br/>
Encyclopedia of gardening 
edited by Christopher Bricksll 
 - London  dorling Kindersley  1992 
 - 548p. :illus.col. ; 28cm. 
<br/><br/><label>ISBN: </label>0  96318  979  2 
<br/><br/><label>Dewey Class. No.: </label>R  / 635.03 ROY