Investigation into the causes of the decline of starlings and house sparrows in Great Britain /
Crick, Humphrey Q. P.
Great Britain.Department for Environment, Food & Rural Affairs.
British Trust for Ornithology.
London : DEFRA,
2002.
A report to the Department for Environment, Food and Rural Affairs by a consortium led by the British Trust for Ornithology.
Starlings
English sparrow
Bird populations