“PENINGKATAN HASIL BELAJAR MATEMATIKA MATERI BANGUN RUANG MELALUI MODEL PROJECT BASED LEARNING BERBANTUAN MEDIA KERTAS KARTON PADA PESERTA DIDIK KELAS V SDN PUTAT JAYA IV-380 SURABAYA”. 2025. Journal of Mathematics Education Research 4 (1). https://journalng.uwks.ac.id/jmer/article/view/493.