 The novel was first published in book form as a paperback by Signet Books in 1973; it was later reprinted by Remploy (1974), Sphere (1978), Del Rey/Ballantine (1981), Baen (1992) and the Thorndike Press (2002).The Remploy edition was both the first British and first hardcover edition.An e-book edition was published by Gollancz's SF Gateway imprint on September 29, 2011 as part of a general release of de Camp's works in electronic form.