PRADIP KOMAR DEY. Differential Extension Contacts. Indian Journal of Extension Education, India, v. 16, n. 3-4, p. 22–31, 1980. DOI: 10.48165/. Disponível em: https://epubs.icar.org.in/index.php/IJEE/article/view/161123. Acesso em: 15 jul. 2026.