O. P. BHATNAGAR A N D K. N. SINGH•. PROBLEMS OF SUBJECT MATTER SPECIALIST3. Indian Journal of Extension Education, India, v. 9, n. 3&4, 2024. DOI: 10.48165/. Disponível em: https://epubs.icar.org.in/index.php/IJEE/article/view/160372. Acesso em: 23 oct. 2025.