Hidayat, Ahmad, Burhanuddin Tola, Slamet Sutanto, Saepudin, Paisal Halim Halim, and Syamsiah Badruddin. 2019. “Productivity Lecturer in the Era of the Industrial Revolution 4.0: Confirmatory Factor Analysis (CFA)”. Helix - The Scientific Explorer | Peer Reviewed Bimonthly International Journal 9 (04):5102-7. https://helixscientific.pub/index.php/home/article/view/4.