Burton w.g. <br/><br/>
The  potato 

 - New york  Longman scientific & technical  1989 
<br/><br/><label>ISBN: </label>0-582-46229-0 
<br/><br/><label>LC Class. No.: </label>633.491/BUR 
<br/><br/><label>Dewey Class. No.: </label>633.491/BUR