*Joachim Fest, "Plotting Hitler's Death: The German Resistance to Hitler, 1933–1945", 1996 (ISBN 0-8050-5648-3)*Hans Bernd Gisevius, "Valkyrie: An Insider's Account of the Plot to Kill Hitler," 2009 reprint of one volume abridgement of two volume text, "To the Bitter End," 1947.
Steven Rendall, Phoenix (Weidenfeld and Nicolson),2009 (ISBN 978-0-7538-2566-2)*Joachim Fest, "Plotting Hitler's Death: The German Resistance to Hitler, 1933–1945", 1996 (ISBN 0-8050-5648-3)*Hans Bernd Gisevius, "Valkyrie: An Insider's Account of the Plot to Kill Hitler," 2009 reprint of one volume abridgement of two volume text, "To the Bitter End," 1947.