GRINGS, Michael. Ernst Engels Entdeckung vor 150 Jahren. German Journal of Agricultural Economics, [S. l.], v. 56, n. 7, 2007. DOI: 10.52825/gjae.v56i7.1696. Disponível em: https://www.tib-op.org/ojs/index.php/gjae/article/view/1696. Acesso em: 22 nov. 2024.