Herbina Br Sembiring and Susanti 2026. THE EFFECT OF RED GUAVA FRUIT ON HEMOGLOBIN (HB) LEVELS OF ADOLESCENT FEMALES IN THE WORK AREA OF TANJUNG BALAI PUBLIC HEALTH CENTER. Zona Kebidanan: Program Studi Kebidanan Universitas Batam. 16, 3 (Sep. 2026). DOI:https://doi.org/10.37776/zkeb.v16i3.2348.