Langman, Rodney E. <br/><br/>
The immune system:  evolutionary principles guide our understanding of this complex biological defense system / 
Rodney E. Langman ; with a foreword by Melvin Cohn. 
 - San Diego :  Academic Press,  1989. 
 - xlvi, 209 p. :  ill. 
<br/><br/><label>ISBN: </label>012436585X (alk. paper) 
<br/><br/><label>LCCN: </label>88901623       
<br/><br/><label>Subjects--Topical Terms: </label><br/>Immune system--Evolution.