C. S.S. RAO. Effectiveness of Audio-Visuals in Disseminating Information As Testified By The Extension Workers. Indian Journal of Extension Education, India, v. 1, n. 1, p. 43–53, 1965. Disponível em: https://epubs.icar.org.in/index.php/IJEE/article/view/159573. Acesso em: 15 jul. 2026.