Einheitsfront und Volksfront in Deutschland. PROKLA. Journal of Critical Social Science, Berlin, DE, v. 7, n. 26, p. 35–74, 1977. DOI: 10.32387/prokla.v7i26.1703. Disponível em: https://prokla.de/index.php/PROKLA/article/view/1703. Acesso em: 6 dec. 2025.