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
"Tolley, Howard Ross and Reynoldson, L. A. (Le Roy August)","The cost and utilization of power on farms where tractors are owned : 286 farms - Ohio, Indiana, Illinois - 1920",,Government Printing Office,1921,Bulletin,,,,https://cir.nii.ac.jp/crid/1130282270874868352