Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Katsuno Aiko,Emotional regulation of 5-year-olds during friendship in Early Childhood Education and Care based on the viewpoint of Setsumen,Early Childhood Care and Education Research Journal,1340-9808,JAPAN SOCIETY of RESEARCH on EARLY CHILDHOOD CARE and EDUCATION,2019,57,2,18-29,https://cir.nii.ac.jp/crid/1390285300162347648,https://doi.org/10.20617/reccej.57.2_18