MacMahon, J A <br/><br/>
Levels of biological organization: an organism-centered approach.  [electronic resource] 

 -  Bioscience  Nov 1978 
 - 700-4 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. 
<br/><br/><label>ISSN: </label>0006-3568 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Anatomy<br/>Biological Evolution<br/>Classification<br/>Ecology<br/>Environment<br/>Phylogeny