Edwards, C. A.  1925- <br/><br/>
Biology and ecology of earthworms 
C. A. Edwards and P. J. Bohlen 
 - 3rd ed. 
 - London  Chapman & Hall  1996 
 - 426 p. : ill. ; 23 cm. 
<br/><br/>p. 310-380 
<br/><br/><label>ISBN: </label>0412561603  RM100.05 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earthworms