Rasida, I., and B. Sahono. “IMPLEMENTATION OF PORTFOLIO-BASED LEARNING STRATEGIES TO IMPROVE STUDENTS ’WRITING SKILLS”. Diadik: Jurnal Ilmiah Teknologi Pendidikan, vol. 8, no. 2, Aug. 2021, pp. 1-11, doi:10.33369/diadik.v8i2.17452.