Priatna, Nanang, et al. “Efektifitas Project Based Learning-STEM Dan Pemecahan Masalah Matematis Siswa Pada Materi Trigonometri”. SJME (Supremum Journal of Mathematics Education), vol. 6, no. 2, July 2022, pp. 151-6, doi:10.35706/sjme.v6i2.6588.