“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 4, no. 1 (June 30, 2023): 26–31. Accessed August 14, 2026. http://universe.ppj.unp.ac.id/index.php/universe/article/view/341.