Originally published, New York: Atheneum, 1964; London: Collins, 1966.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
May I bring a friend? by Beatrice Schenk De Regniers. ISBN 0140500472. Published by Penguin in 1972. Publication and catalogue information, links to buy online and reader comments.
