Melati, Melati, and Tritiyatma Hadinugrahaningsih. “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, vol. 1, no. 1, May 2024, pp. 24-29, https://doi.org/10.70232/c99bex94.