Dharmazie Dwi Ilham, Mesra B, and Elfitra Desy Surya. “ANALYSIS OF INTERNAL COMMUNICATION AND WORK SYSTEMS ON WORK PRODUCTIVITY WITH MOTIVATION AS AN INTERVENING VARIABLE IN THE OFFICE HEAD OF MEDAN BELAWAN DISTRICT”. Multidiciplinary Output Research For Actual and International Issue (MORFAI) 4, no. 4 (July 31, 2025): 1848–1855. Accessed October 23, 2025. https://radjapublika.com/index.php/MORFAI/article/view/3657.