SHARMA, S.; KUMAR, A.; SINGH, M. Digital Reference Service. DESIDOC Journal of Library & Information Technology, [S. l.], v. 24, n. 6, 2003. DOI: 10.14429/djlit.24.6.3641. Disponível em: https://publications.drdo.gov.in/ojs/index.php/djlit/article/view/3641. Acesso em: 27 jun. 2025.