“Penerapan Model Pembelajaran Kooperatif dengan Pendekatan Struktural Bersama Kepala Bernomor untuk Meningkatkan Pencapaian Kompetensi Matematika Siswa Kelas VIII/C SMP: Application of Cooperative Learning Model with Numbered Heads Together Structural Approach to Improve Achievement of Mathematicals Competence of Students in Class VIII/C SMP”, st, vol. 2, no. 2, Jun. 2019, doi: 10.32734/st.v2i2.547.