"A report by The Royal Society for the Protection of Birds, as part of a programme of work jointly funded by English Nature and the RSPB; English Nature Project Reference FST20-11-011; August 2004" -- t.p.
Literature review on the impact on bird populations of disturbance due to human access on foot by Emily Woodfield. ISBN 1901930513. Published by The Royal Society for the Protection of Birds in 2004. Publication and catalogue information, links to buy online and reader comments.