"This book published to accompany the exhibition ... at the National Gallery, London, from 12 November 2008 to 15 February 2009 and at Amgueddfa Cymru-National Museum Wales, Cardiff, from 7 March to 14 June 2009"--Colophon.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Sisley in England and Wales by Christopher Riopelle. ISBN 9781857094138. Published by National Gallery Co. in 2008. Publication and catalogue information, links to buy online and reader comments.
