Briggs, David. <br/><br/>
Plant variation and evolution / 
[by] D. Briggs and S.M. Walters. 
 - London :  Weidenfeld & Nicolson,  [1972] 
 - World university library .
<br/><br/> First published in 1969. 
<br/><br/>Bibliography: p. 240-252. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plants -- Variation.--Plants -- Variation.