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
"Valgren, Victor Nelson and Engelbert, Elmer Eugene","Farm mortgage loans by banks, insurance companies, and other agencies",,[U.S. G.P.O],1921,Bulletin,,,,https://cir.nii.ac.jp/crid/1130282269985437824