Naseri D, Cahyani A, Manalu HG, Angellina V. Correlation Between Age and Knowledge Among The Student of SMP "X" with The Occurrence of Free Sex. J. Med. Health [Internet]. 2018Feb.27 [cited 2023Oct.2];2(1). Available from: https://journal.maranatha.edu/index.php/jmh/article/view/739