"Based on the 'Winnie-the-Pooh' works by A.A. Milne and E.H. Shepard"--p. facing t.p.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Eeyore has a birthday. ISBN 140520527X. Published by Egmont in 2003. Publication and catalogue information, links to buy online and reader comments.
