"February 2008"--T.p.
"Report of work carried out by the British Trust for Ornithology under contract to AEWA Secretariat"--T.p.
Review of the status of introduced non-native waterbird species in the area of the African-Eurasian Waterbird Agreement: 2007 update. ISBN 9781906204655. Published by British Trust for Ornithology in 2009. Publication and catalogue information, links to buy online and reader comments.