Hati, L. P., F. Harahap, S. ., and M. Saidin. “The Maritime Historical Background Of Bogak Port (8-20 Century), Tanjung Tiram District, Batubara Regency, North Sumatera Province”. International Journal of Cultural and Art Studies, vol. 1, no. 1, Oct. 2018, pp. 28-35, doi:10.1234/ijcas.v1i1.452.