RENNITA, Oktavia Dwi. The Differences of Improving Communication Ability and Mathematical Concepts Understanding between Students that Given Problem Based Learning and Discovery Learning at SMP Swasta Al-Hikmah Medan. Advances in Social Sciences Research Journal, [S. l.], v. 5, n. 10, 2018. DOI: 10.14738/assrj.510.5467. Disponível em: https://scholarpublishing.org/journals/index.php/ASSRJ/article/view/3234. Acesso em: 28 may. 2026.