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Yohana Nensy Lasamahu, - and Sri Widati, - (2022) DIFFERENCES IN TEENAGE GIRLS’ KNOWLEDGE AND ATTITUDE BEFORE AND AFTER BEING EXPOSED IN PUBLIC SERVICE ANNOUNCEMENT MEDIA OF "IRON SUPPLEMENTATION"(Study at SMP Negeri 10 Surabaya). The Indonesian Journal of Public Health, 17 (2). pp. 252-263. ISSN 2540-8836