VADEN, W. M. Fossil Energy Information Resources in the U. S. Journal of Information and Knowledge, [S. l.], v. 14, n. 2, p. 75–83, 1977. DOI: 10.17821/srels/1977/v14i2/50527. Disponível em: https://srels.org/index.php/sjim/article/view/50527. Acesso em: 8 jan. 2025.