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Pangur Ban originally published in 1983. Shape-shifter originally published in 1988.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Shape-shifter : the naming of Pangur Ban ; Pangur Ban : the white cat by Fay Sampson. ISBN 073241623X. Published by Lion in 1997. Publication and catalogue information, links to buy online and reader comments.