Melati M, Hadinugrahaningsih T. The Effect of Numbered Head Together (NHT) in a Flipped Classroom Environment on Students’ Self-Efficacy and Achievement on Colloid Topics. J Res Educ Pedagog [Internet]. 2024 May 1 [cited 2026 Apr. 29];1(1):24-9. Available from: https://spm-online.com/jrep/index.php/journal/article/view/3