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 United States. Children's Bureau,"Play and recrestion : outlines for study : separate no. 3, Child welfare",2nd ed.,Government Printing Office,1925,Bureau publication,,,,https://cir.nii.ac.jp/crid/1130282271793947392