Tyagita Widya Sari and Putri Octia Hairanitrans. 2021. Differences in Knowledge Before and After Counseling on Sex Education to Students at SMA Negeri 1 Kampar Timur Riau Province. Jurnal Indah Sains dan Klinis. 2, 2 (Aug. 2021), 18–21. DOI:https://doi.org/10.52622/jisk.v2i2.20.