Zebiniso Kudaybergenova Karimbergen kizi. “PROBLEM-BASED TEACHING METHOD TO IMPROVE SPEAKING SKILLS OF B1-B2 LEVEL LEARNERS”. Journal of Applied Science and Social Science, vol. 16, no. 4, Apr. 2026, pp. 969-74, https://www.internationaljournal.co.in/index.php/jasass/article/view/4138.