Bird population studies :  relevance to conservation and management/ 
Perrins, Christopher M. …[et al.]. 
 - Ne York Toronto  oxford university press  1991 
 - ix;683p. 
<br/><br/><label>ISBN: </label>9780198540823 
<br/><br/><label>LC Class. No.: </label>QL677.4  / .B57 1991