“The Effect of Classical Guidance Services Using the Jigsaw Cooperative Learning Model on Students’ Self-Regulation at SMA Negeri 8 Medan”. Cakrawala Sekolah: Journal of Multidisciplinary School Education, vol. 1, no. 2 May, June 2026, pp. 14-20, https://doi.org/10.66851/csjmse.v1i2.242.