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.