Sembiring, Serly Monika Br. “The Effectiveness of Buzz Group Disscussionon Knowledge and Attitudes about Prannal Sex in Adolescents at Vocational School of Pencawan Medan”. International journal of health & medical sciences 4, no. 1 (February 18, 2021): 56-60. Accessed July 17, 2024. https://sloap.org/journal/index.php/ijhms/article/view/775.