Fadhila, N., Wastuti, S. N. Y. and Astuti, S. (2025) “THE APPLICATION OF PROBLEM-BASED LEARNING TECHNIQUES IN CLASSICAL SERVICES TO INCREASE SELF-CONFIDENCE”, Algebra : Jurnal Pendidikan, Sosial dan Sains, 5(2), pp. 226–232. doi: 10.58432/algebra.v5i2.1267.