Melati, Melati, and Tritiyatma Hadinugrahaningsih. 2024. “The Effect of Numbered Head Together (NHT) in a Flipped Classroom Environment on Students’ Self-Efficacy and Achievement on Colloid Topics”. Journal of Research in Education and Pedagogy 1 (1): 24-29. https://doi.org/10.70232/c99bex94.