Heir to the Empire: The 20th Anniversary EditionCanonLegendsInfinities Development Heir to the Empire: The 20th Anniversary Edition was originally scheduled for a June 21, 2011 release. Editions ISBN 9780345528292; September 6, 2011; Del Rey; US hardcoverISBN 9780345530004; September 6, 2011; Del Rey; US eBookSources Star Wars Year By Year: A Visual History, New EditionAppearances