Siallagan, P., Isfarudi, I. and Koswara, H. 2023. Quality of Service at the Office Environment of National Political Unity and Community Protection of Mentawai Islands Regency. Science and Environmental Journal for Postgraduate. 5, 2 (Jun. 2023), 208-216. DOI:https://doi.org/10.24036/senjop.v5i2.204.