WITZEL, Ernst. Stallbaukosten aus dem Internet. agricultural engineering.eu, [S. l.], v. 57, n. 2, p. 78–79, 2002. DOI: 10.15150/lt.2002.1582. Disponível em: http://195.37.233.21/landtechnik/article/view/2002-57-2-078-079. Acesso em: 9 apr. 2025.