Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SAKAI Akira,An Inquiry from the Perspective of Teaching Methods into Connecting Early Childhood Education with Elementary Education: A Critical Examination of Developmental Stage Theory,THE JAPANESE JOURNAL OF EDUCATIONAL RESEARCH,03873161,Japanese Educational Research Association,2014,81,4,384-395,https://cir.nii.ac.jp/crid/1390001205292485760,https://doi.org/10.11555/kyoiku.81.4_384