Pagampa, Yanti Inna, et al. “The Teacher’s Challenges of the Implementation of Problem-Based Learning in Teaching English at SMKN 1 Toraja Utara”. Jurnal Studi Guru Dan Pembelajaran, vol. 6, no. 1, Apr. 2023, pp. 109-1, doi:10.30605/jsgp.6.1.2023.6297.