A. D. D. Evera, K. J. P. Flores, C. E. Garcia, H. S. T. Guanlao, G. R. S. Solatre, and N. D. Esteban, “Challenges in the Development of Instructional Materials Among In-Service Elementary Teachers”, SJTER, vol. 3, no. 1, pp. 147–158, Jun. 2026, doi: 10.65141/sjter.v3i1n9.