KRATHWOHL, E. J. . Retail Energy Contracts: Choices for Customers. Distributed Generation & Alternative Energy Journal, [S. l.], v. 14, n. 2, p. 33–39, 1999. DOI: 10.13052/dgaej2156-3306.1426. Disponível em: https://journals.riverpublishers.com/index.php/DGAEJ/article/view/14705. Acesso em: 14 may. 2026.