Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yamamura Asayo,The difference in helping strategy between elementary school and university students,Journal of Human Environmental Studies,13485253,Society for Human Environmental Studies,2017,15,1,9-15,https://cir.nii.ac.jp/crid/1390001205297789440,https://doi.org/10.4189/shes.15.9