Bull, John. <br/><br/>
The Audubon Society Field Guide to North American Birds  : eastern region 

 - New York :  Knopf,  1990 [c.1977] 
 - 784 p.  : ilus. 
<br/><br/> 59-70 
<br/><br/><label>LCCN: </label>5681 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aves--E.U.A.<br/>Aves--Hábitos y conducta.
<br/><br/><label>Dewey Class. No.: </label>598.2  / B85