Molek, Dwi Setya Rini, and Mangatas Halomoan Parluhutan Hutagulung, “The Efficacy of the Consumption of Manalagi Apples and Fuji Apples on Decreasing Plaque Index in Students of Madrasah Aliyah Al-Hidayah Labuhan Batu Selatan, North Sumatra”, Eu Herb Ina, vol. 2, no. 1, pp. 75-80, Mar. 2021.