VAN DER STEEN, Bart; ANDRÉE, Aela; HELMUS, Merle. Moedig in de Marge: Leidse revolutionair-socialisten tussen de wereldoorlogen als politieke familie. TSEG - The Low Countries Journal of Social and Economic History, [S. l.], v. 21, n. 3, p. 107–144, 2024. DOI: 10.52024/h7wt3b60. Disponível em: https://tseg.nl/article/view/18131.. Acesso em: 21 dec. 2024.