Krebs, J R . An introduction to behavioural ecology / J.R. Krebs and N.B. Davies. - Oxford : Blackwell Scientific Publns. , 1981. - 389p. : ills ; 22cm . Includes bibliographical references and index ISBN: 0632014989 UKP 14.50 Subjects--Index Terms: ECOLOGY Dewey Class. No.: 591.51 / KRE/I