Christiana, Ananda Ekka, Andi Hayyun Abiddin, and Wiwin Martiningsih. “The Relationship Between Breakfast Habits and Learning Concentration of Elementary School Students”. Health Access Journal 1, no. 3 (October 28, 2024): 91–98. Accessed October 27, 2025. https://ojs.poltekkes-malang.ac.id/HAJ/article/view/4580.