Sinurat NU, Raja JL, Siadari MK, Doloksaribu DS, Silalahi D. The Effectiveness of English Songs to Improve Students’ Speaking Skills by Using Problem-Based Learning Methods in Grade XIth Students at SMKS 1 Tamansiswa Pematangsiantar. Innovative [Internet]. 2025 Feb. 10 [cited 2026 Aug. 26];5(1):5697-711. Available from: https://j-innovative.org/index.php/Innovative/article/view/17988