Nugroho, FX.Febriyanto Adi, and Dwi Sulisworo. “Pengembangan Media Powerpoint Materi Rasio Trigonometri Dengan Model Problem Based Learning Di SMA Negeri 1 Klaten”. JS (JURNAL SEKOLAH), vol. 5, no. 2, July 2021, pp. 16-25, doi:10.24114/js.v5i2.26304.