著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Streefland, Leen",Realistic mathematics education in primary school : on the occasion of the opening of the Freudenthal Institute,,CD-β Press,1991,CD-β series on research in education,,9073346118,,https://cir.nii.ac.jp/crid/1970304959863363529