ms: Semasa Perang Dunia Pertama, beliau bekerja di Geneva, di mana beliau belajar dengan Willi Mnzenberg. Semasa Perang Dunia Pertama beliau bekerja di Geneva, di mana beliau belajar dengan Willy Mnzenberg.
en: During the First World War , he worked in Geneva , where he studied with Willi Münzenberg . During the First World War he worked in Geneva , where he studied with Willy Münzenberg .