The official website of Gerhard Richter (www.gerhard-richter.com) has been created, and is maintained, by Joe Hage.
Thanks to Dietmar Elger (author of Gerhard Richter, Catalogue Raisonné, Vol. 1, 2011 and Vol. 3, 2013) for his help and support.
Thanks to Hubertus Butin for his extensive and detailed information on Gerhard Richter's editions.
Thanks to Amy Dickson for her work on the Chronology.