TY  - BOOK
AU  - Krebs, J.R. and  N.B. Davies
TI  - An introduction to behavioural ecology 
SN  - 0-632-03546-3
AV  - QH 366.2 K7 1993
PY  - 1993///
CY  - Blackwell Scientific Pub
PB  - Oxford 
ER  -