Safitri, Resti Rima, et al. “Problem Solving Dalam Meningkatkan Kemampuan Berpikir Kritis Siswa SMK”. Nusantara of Research : Jurnal Hasil-Hasil Penelitian Universitas Nusantara PGRI Kediri, vol. 5, no. 2, Oct. 2018, pp. 83-88, https://doi.org/10.29407/nor.v5i2.13079.