Abercrombie, M. <br/><br/>
The Penguin Dictionary of Biology 
Abercrombie, M. 
 - New York  Penguin Books  1979 
 - 6th ed. 
<br/><br/><label>ISBN: </label>140510036 
<br/><br/><label>LC Class. No.: </label>QH-13.A25-1979