CALZAVARA, Oswaldo. The integrated development of family farms based on the systems and community organization concepts. Semina: Ciências Agrárias, [S. l.], v. 15, n. 1, p. 56–61, 1994. DOI: 10.5433/1679-0359.1994v15n1p56. Disponível em: https://www.ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/4394. Acesso em: 19 dec. 2025.