Nessa, W., Hartono, Y. and Hiltrimartin, C. (2017) “Pengembangan Buku Siswa Materi Jarak pada Ruang Dimensi Tiga Berbasis Science, Technology, Engineering, and Mathematics (STEM) Problem-Based Learning di Kelas X”, Jurnal Elemen, 3(1), pp. 1–14. doi: 10.29408/jel.v3i1.273.