Samuel, Jefry, et al. “The Effect of Numbered Head Together Learning Model Assisted by Learner Worksheets on Mathematical Problem-Solving Ability”. EduMatSains : Jurnal Pendidikan, Matematika Dan Sains, vol. 10, no. 2, Oct. 2025, pp. 1-14, doi:10.33541/edumatsains.v10i2.7011.