Foundation's Friends, Stories in Honor of Isaac Asimov is a 1989 book written in honor of science fiction author Isaac Asimov, in the form of an anthology of short stories set in Asimov's universes, particularly the Foundation universe. The anthology was edited by Martin H. Greenberg, and contributing authors include Ray Bradbury, Robert Silverberg, Frederik Pohl, Poul Anderson, Harry Turtledove, and Orson Scott Card. It commemorated Asimov's 50th anniversairy as an author. A number of writers who contributed to the anthology are also portrayed on the book's cover.A "revised and expanded" edition was published in 1997, which added numerous memorials and appreciations written by those who knew him, many of them well-known authors and editors from the science fiction field. Hardback: ISBN 0-312-93174-3 Paperback: ISBN 0-8125-0980-3 Revised and Expanded Edition (Paperback): ISBN 0-8125-6770-6 Source: Wikipedia (en)