Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Cooper, Hermann",An accounting of progress and attendance of rural school children in Delaware : a report of results secured from an analysis of the eight-year individual attendance and progress cumulative records of the 1915 entrants into grade I of the rural and village schools of the State of Delaware,,"Teachers College, Columbia University",1930,Contributions to education,,,,https://cir.nii.ac.jp/crid/1130000794267910144