RUBIK, Frieder. Step by Step. Ökologisches Wirtschaften - Fachzeitschrift, [S. l.], v. 13, n. 3-4, 1998. DOI: 10.14512/oew.v13i3-4.951. Disponível em: https://www.oekologisches-wirtschaften.de/index.php/oew/article/view/951. Acesso em: 29 apr. 2024.