Baidowi, Baidowi, et al. “Peningkatan Hasil Belajar Matematika Siswa Kelas VIII SMPN 13 Mataram Tahun Ajaran 2017 2018 Melalui Lesson Study”. Mandalika Mathematics and Educations Journal, vol. 1, no. 1, July 2019, pp. 1-12, doi:10.29303/jm.v1i1.537.