Naseri, Dani, Arifani Cahyani, Helena G. Manalu, and Vanny Angellina. 2018. “Correlation Between Age and Knowledge Among The Student of SMP "X" With The Occurrence of Free Sex”. Journal of Medicine and Health 2 (1). Bandung, Indonesia. https://doi.org/10.28932/jmh.v2i1.739.