Nugroho, F.A. and Sulisworo, D. 2021. Pengembangan Media Powerpoint Materi Rasio Trigonometri Dengan Model Problem Based Learning di SMA Negeri 1 Klaten. JS (JURNAL SEKOLAH). 5, 2 (Jul. 2021), 16–25. DOI:https://doi.org/10.24114/js.v5i2.26304.