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 "Cooper, M. R. and Washburn, R. S. and United States Department of Agriculture","Cost of producing wheat : on 481 farms in the states of North and South Dakota, Minnesota, Kansas, Nebraska, and Missouri, for the crop year 1919",,Government Printing office,1921,Bulletin,,,,https://cir.nii.ac.jp/crid/1130282269378898432