Kalilu, Nikodemus, et al. “Identification of Seawater Intrusion Using Geoelectrical Method With Wenner-Schulumberger Configuration: A Case Study in Southern Tolonuo Island, North Halmahera Regency, Indonesia”. International Journal of Hydrological and Environmental for Sustainability, vol. 1, no. 2, June 2022, pp. 86-96, https://doi.org/10.58524/ijhes.v1i2.112.