Originally published: Martin Secker & Warburg Ltd., 1966.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Glencoe : the story of the massacre by John Prebble. ISBN 0140028978. Published by Penguin in 2005. Publication and catalogue information, links to buy online and reader comments.
obnb.uk is a Good Stuff website.