(1)
Sinurat, N. U.; Raja, J. L.; Siadari, M. K.; Doloksaribu, D. S.; 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 2025, 5, 5697-5711.