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. 2024;1(1):24-29. Accessed July 7, 2024. https://spm-online.com/jrep/index.php/journal/article/view/3