SATHYANARAYANA, N. Document Delivery-Past, Present and Future. DESIDOC Journal of Library & Information Technology, [S. l.], v. 15, n. 1, 2002. DOI: 10.14429/djlit.15.1.3173. Disponível em: https://publications.drdo.gov.in/ojs/index.php/djlit/article/view/3173. Acesso em: 17 sep. 2025.