Paperback
details (UK).(see also: CD-ROM · eBook (Kindle) · Audible Audiobook)
details (United States).(see also: Audible Audiobook · eBook (Kindle) · Audio CD)
details (Germany).(see also: CD-ROM · Kindle Ausgabe · Audible Hörbuch)
details (Canada).(see also: eBook (Kindle) · eBook (Kindle) · eBook (Kindle))
ISBN: 978-0-14-004312-9
ISBN-10: 0-14-004312-8
Penguin · 1976