TY  - BOOK
AU  - Perrins,Christopher M.
AU  - Lebreton,J.D.
AU  - Hirons,G.J.M.
TI  - Bird population studies: relevance to conservation and management 
SN  - 0198577303
PY  - 1991///
CY  - Oxford
PB  - Oxford University Press
KW  - Bird populations
KW  - Birds, Protection of
ER  -