Ecological census techniques :  a handbook / 
edited by William J. Sutherland. 
 - 2nd  ed. 
 - Cambridge :  C. U. P.,  2006. 
 - xv, 432  p. 
<br/><br/><label>ISBN: </label>0521606363 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecological survey--Methodology.