The Collected Papers of Albert Einstein, Volume 15: The Berlin Years: Writings & Correspondence, June 1925–May 1927
The Collected Papers of Albert Einstein, Volume 14: The Berlin Years: Writings & Correspondence, April 1923–May 1925
The Collected Papers of Albert Einstein, Volume 13: The Berlin Years: Writings & Correspondence, January 1922 – March 1923
The Collected Papers of Albert Einstein, Volume 12: The Berlin Years: Correspondence – Documentary Edition