Letters and Papers from Prison (Dietrich Bonhoeffer Works English Edition, vol. 8) by Dietrich Bonhoeffer; Dietrich Bonhoeffer’s “Letters and Papers from Prison”: A Biography (Lives of Great Religious Books Series) by Martin E. Marty; Bonhoeffer: Pastor, Martyr, Prophet, Spy: A Righteous Gentile vs. the Third Reich by Eric Metaxas; Bonhoeffer: A Brief Overview of the Life and Writings of Dietrich Bonhoeffer (1906–1945) (Theology for Life Series) by John W. Matthews