Smith, G., M. Amirudin Ichda, M. Alfan, and T. Kuncoro. “Literacy Studies: Implementation of Problem-Based Learning Models to Improve Critical Thinking Skills in Elementary School Students”. KnE Social Sciences, Vol. 8, no. 10, June 2023, pp. 222–233, doi:10.18502/kss.v8i10.13449.