The Effect of Classical Guidance Services Using the Jigsaw Cooperative Learning Model on Students’ Self-Regulation at SMA Negeri 8 Medan. Cakrawala Sekol. J. Multidiscip. Sch. Educ. 2026, 1 (2 May), 14-20. https://doi.org/10.66851/csjmse.v1i2.242.