Hodriani, Julia Ivanna and Surya Dharma 2021. Mutual Cooperation Culture of Pakpak Ethnic Communities North Sumatera: As Far As The Student Understands It?. Polit Journal Scientific Journal of Politics. 1, 1 (Feb. 2021), 1-10. DOI:https://doi.org/10.33258/polit.v1i1.362.