Rasida, I. and Sahono, B. 2021. IMPLEMENTATION OF PORTFOLIO-BASED LEARNING STRATEGIES TO IMPROVE STUDENTS ’WRITING SKILLS. Diadik: Jurnal Ilmiah Teknologi Pendidikan. 8, 2 (Aug. 2021), 1–11. DOI:https://doi.org/10.33369/diadik.v8i2.17452.