The Units of evolution :  essays on the nature of species / 
edited by Marc Ereshefsky. 
 - Cambridge, Mass. :  MIT Press,  c1992. 
 - xvii, 405 p. :  ill. ;  23 cm. 
<br/><br/> "A Bradford book." 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0262550202 (pbk.) 0262050447 
<br/><br/><label>LCCN: </label>91004097 //r93 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Species.
<br/><br/><label>LC Class. No.: </label>QH380  / .U54 1992 
<br/><br/><label>Dewey Class. No.: </label>574/.012