Ernest Jones schreibt an Otto Rank: "Dear Otto, Is it certain that O. Gross is dead this time? Will you please send me his last book 'Drei Aufsätze uber [sic!] den inneren Konflikt.' (Marcus & Weber, Bonn, 1920); perhaps you can get a review copy."

Institute of Psycho-Analysis, London, Archives, Sign.: CRA/FO6/29