Heir to the Empire: The 20th Anniversary Edition (audiobook)CanonLegendsInfinities Editions ISBN 9780307933553; September 6, 2011; Random House Audio; Compact discISBN 9780307933560; September 6, 2011; Random House Audio; Digital downloadAppearancesHeir to the Empire: Star Wars Legends (The Thrawn Trilogy) on Penguin Random House's official website (backup link) (Unknown)Unknown UnknownNone