The Effect Of Numbered Head Together (NHT) Cooperative Learning Model On Students Learning Outcomes On Human Respiratory System Materials At SMPN 2 Solok City. universe [Internet]. 30 Juni 2023 [dikutip 14 Agustus 2026];4(1):26-31. Tersedia pada: http://universe.ppj.unp.ac.id/index.php/universe/article/view/341