Sari M, Julisti V, Putri ZD, Sameto MB. The Application of Mutual Cooperation on the Social Development of Children Aged 5-6 Years. JIE [Internet]. 2025 Dec. 31 [cited 2026 Jan. 10];4(3):779-84. Available from: https://ejournal.stitahlussunnah.ac.id/index.php/JIE/article/view/546