Sriyanti, Ika, AND Yaniawati, R.. " PENINGKATAN KEMAMPUAN PEMAHAMAN MATEMATIKA SISWA SMP PGRI PAMANUKAN MELALUI MODEL PEMBELAJARAN KOOPERATIF TIPE STAD" Symmetry: Pasundan Journal of Research in Mathematics Learning and Education [Online], Volume 2 Number 2 (31 December 2017)