Ayu, I. P., & Marwiyah, N. (2019). The Relationship Between Assertive Attitude and Self-Concept with Premarital Sexual Behavior in Adolescents at SMP Negeri 17 Kota Serang. Faletehan Health Journal, 6(2), 56–63. https://doi.org/10.33746/fhj.v6i2.31