Calabi, Prassede. <br/><br/>
Ecology :  a systems approach / 
Prassede Calabi. 
 - Dubuque, Iowa :  Kendall/hunt Publishing Co.,  1998. 
 - xvi, 56 p. :  ill. ;  28 cm. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>078723561X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.<br/>Evolution.