Silalahi, Jernita Damayanti, et al. “AN ANALYSIS OF STUDENTS’ LEARNING OUTCOMES AFTER THE IMPLEMENTATION OF PROBLEM BASED LEARNING (PBL) IN THE DEVELOPMENT OF MATHEMATICS WORKSHEETS IN ELEMENTARY SCHOOLS: A LITERATURE STUDY”. Jurnal Merah Putih Sekolah Dasar, vol. 1, no. 4, Mar. 2024, pp. 125-39, doi:10.24114/jmpsd.v1i4.58626.