This collection originally published: in 1 vol. London : W.H. Allen, 1971.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The ghouls by Peter Haining. ISBN 0860078078. Published by Futura Publications Ltd in 1974. Publication and catalogue information, links to buy online and reader comments.
obnb.uk is a Good Stuff website.