Hartika, A.Y. et al. 2023. Analysis of Food Cost and Food Perception with Food Waste of The Supplemental Food for School Children in Elementary School Children at Kulon Progo District. Darussalam Nutrition Journal. 7, 1 (Jul. 2023), 32–40. DOI:https://doi.org/10.21111/dnj.v7i1.120.