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