Halik, F. et al. 2022. VALIDITY OF TEACHING MATERIALS BASED ON PROBLEM BASED LEARNING IN BASIC STATISTICS COURSE IN GRAPHICS ENGINEERING STUDENTS: VALIDITAS BAHAN AJAR BERBASIS PROBLEM-BASED LEARNING UNTUK PEMBELAJARAN STATISTIKA DASAR BAGI MAHASISWA TEKNIK GRAFIS. MaPan : Jurnal Matematika dan Pembelajaran. 10, 2 (Dec. 2022), 207–218. DOI:https://doi.org/10.24252/mapan.2022v10n2a2.