Der rationale Schmarotzer. PROKLA. Journal of Critical Social Science, Berlin, DE, v. 19, n. 77, p. 33–54, 1989. DOI: 10.32387/prokla.v19i77.1216. Disponível em: https://prokla.de/index.php/PROKLA/article/view/1216. Acesso em: 10 jan. 2026.