Festiawan, R.; Hooi, L. B. .; Widiawati, P. .; Yoda, I. K. .; S, A. .; Antoni, M. S. .; Nugroho, A. I. . The Problem-Based Learning: How the Effect on Student Critical Thinking Ability and Learning Motivation in COVID-19 Pandemic? . j. Sport Area 2021, 6, 231-243.