Paperback
details (USA).(see also: Audible Audiobook · Audio Cassette · eBook (Kindle))
details (UK).(see also: Audible Audiobook · eBook (Kindle) · Audio Cassette)
details (Germany).(see also: Kindle Ausgabe · Kindle Ausgabe)
details (Canada).(see also: eBook (Kindle) · Audio Cassette)
ISBN: 978-87-429-7451-3
ISBN-10: 87-429-7451-8
Penguin Books · 1968