Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yamamoto Naofumi and Okada Akira,Design elements of comprehensible warning pictogram for the children,Journal of Human Life Engineering,13458051,Research Institute of Human Engineering for Quality Life,2011,12,1,45-50,https://cir.nii.ac.jp/crid/1390288092993367680,https://doi.org/10.32159/ningenseikatsukogaku.12.1_45