Umar, U., M. Purwanto, and M. Al Firdaus. “RESEARCH AND DEVELOPMENT: AS THE PRIMARY ALTERNATIVE TO EDUCATIONAL RESEARCH DESIGN FRAMEWORKS”. JELL (Journal of English Language and Literature) STIBA-IEC Jakarta, Vol. 8, no. 01, Mar. 2023, pp. 73-82, doi:10.37110/jell.v8i01.172.