Gulls of Europe, Asia and North America (Helm Identification Guides)
"A monumental effort by the authors and takes a worthy 'podium finish' in this year's award (the BB/BTO Best Bird Book of the Year 2005)." British Birds (Feb 2006) "(This book) has taken gull identification to a very advanced level and argues for some controversial species splits." Wildlife and Countryside (Dec 2005)