Siagian, R. J., P. M. Sitanggang, C. Manurung, V. A. Lubis, and J. Batubara. “Religious Behaviour and Social Harmony in the Framework of the NKRI: A Study of Religious Sciences on Religious Harmony in the Toba Area”. Pindus Journal of Culture, Literature, and ELT, vol. 2, no. 11, Nov. 2022, pp. 162-74, doi:10.51699/pjcle.v2i11.540.