Ginaya, G., I. N. Kanca, and N. N. Sri Astuti. “Designing Problem-Based Learning (PBL) Model for Tourism Vocational Education in 4.O Industry”. International Journal of Linguistics, Literature and Culture, vol. 6, no. 1, Jan. 2020, pp. 14-23, doi:10.21744/ijllc.v6n1.808.