Umar, Umar, M Purwanto, and Moch. Al Firdaus. “RESEARCH AND DEVELOPMENT: AS THE PRIMARY ALTERNATIVE TO EDUCATIONAL RESEARCH DESIGN FRAMEWORKS”. JELL (Journal of English Language and Literature) STIBA-IEC Jakarta 8, no. 01 (March 2, 2023): 73-82. Accessed November 24, 2025. https://journal.stibaiec-jakarta.ac.id/ojs/index.php/jell/article/view/172.