The Effect Of Project Based Learning Model Based STEM On The Knowledge Competence Of Class VII Students Of SMPN 8 Payakumbuh. universe [Internet]. 30 Juli 2025 [dikutip 13 Agustus 2026];6(1):53-62. Tersedia pada: http://universe.ppj.unp.ac.id/index.php/universe/article/view/588