Manalu, S. “Upaya Meningkatkan Prestasi Belajar Matematika Melalui Penggunaan Strategi Problem Posing Berkelompok: Efforts To Increase Mathematics Learning Achievement Through The Use Of Group Posing Problem Strategies”. Neraca: Jurnal Pendidikan Ekonomi, vol. 7, no. 1, Oct. 2021, pp. 59-63, doi:10.33084/neraca.v7i1.2841.