Paperback
details (USA).(see also: eBook (Kindle) · Audible Audiobook · MP3 CD)
details (UK).(see also: Audible Audiobook · MP3 CD)
details (Germany).(see also: Audible Hörbuch · MP3 CD)
details (Canada).(see also: eBook (Kindle) · MP3 CD)
ISBN: 978-0-441-74887-7
ISBN-10: 0-441-74887-2
Ace Books · 1981