Paperback
details (UK).
(see also: Audible Audiobook · Audio CD)
details (USA).
(see also: Audible Audiobook)
details (Germany).
(see also: Audible Hörbuch)
details (Canada).
(see also: Audible Audiobook)
ISBN: 978-0-7088-4762-6
ISBN-10: 0-7088-4762-5
Sphere · 1981