M. Fakhriza , Ganefri, Sukardi , Erwinsyah Simanungkalit , Arfanda AS. (2021). VALIDATION OF HEUTAGOGY PROBLEM-BASED LEARNING MODEL DEVELOPMENT ASSISTED BY APPLICATION MANAGEMENT SYSTEM. Turkish Journal of Computer and Mathematics Education (TURCOMAT), 12(13), 7390–7401. https://doi.org/10.17762/turcomat.v12i13.10603