Fitrya, N., Wirman, S. P., & Rahayu, R. D. (2021). Environmentally Friendly Emergency Lighting System Using Bio Batteries from Pineapple Skin Waste as Energy Source. JURNAL ILMU FISIKA, 13(2), 118–125. https://doi.org/10.25077/jif.13.2.118-125.2021