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 .
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.