Hutagalung, L., A. PURWANTO, A. B. Prasetya, and R. Pramono. “TRANSFORMATIONAL LEADERSHIP FOR ENTERING INDUSTRIAL REVOLUTION 4.0 AS COMPARED WITH HUMANE LEADERSHIP AND ‘U’ THEORY”. IJOSPOL - International Journal of Social, Policy and Law , vol. 1, no. 1, Dec. 2020, pp. 73-78, doi:10.8888/ijospl.v1i1.20.