Rindrayani, Sulastri Rini. “The Effect of Problem-Based Learning Online System Assisted by Google Classroom Combination of Zoom on Microeconomics Learning Outcomes and Responsibility for Students of the Economic Education Study Program in the New Normal Period”. Efektor 8, no. 2 (November 30, 2021): 122 -. Accessed May 19, 2024. https://ojs.unpkediri.ac.id/index.php/efektor-e/article/view/16306.