Paperback
details (UK).(see also: Audible Audiobook)
details (United States).(see also: eBook (Kindle) · Audible Audiobook)
details (Germany).(see also: Kindle Ausgabe · MP3 CD · Audible Hörbuch)
details (Canada).(see also: eBook (Kindle) · Audible Audiobook)
ISBN: 978-0-09-913300-1
ISBN-10: 0-09-913300-8
Orbit · 1976