Breeding birds in the wider countryside : their conservation status (1972-1996) : a report of the BTO's integrated population monitoring programme /
Crick, Humphrey Q. P.
British Trust for Ornithology.
Joint Nature Conservation Committee (Great Britain)
Thetford : BTO,
1998.
"This work was undertaken within a partnership between the British Trust for Ornithology (BTO) and the Joint Nature Conservation Committee as part of its programme of research into nature conservation."