Harahap, P. H.; Lenny Gusti Arini; Dewi Ramayani; Asni Nasution; Murni Hati Harahap; Juni Arpah; Ruth Mevy Sitorus; Julia Rahmadani. Devolovment Language Indonesian Writing Materials at SD Negeri 060837 Medan. IJERE 2025, 4, 849-851.