2026. SYNERGIZING PROBLEM-BASED LEARNING AND AI TOOLS: A LONGITUDINAL STUDY ON SPEAKING PROFICIENCY AT THE B2 LEVEL. Qo‘qon DPI. Ilmiy xabarlar jurnali. 8, 5. (Jul. 2026), 1487–1491. DOI:https://doi.org/10.70728/c.series.ped.v08.i05.236.