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
"Rosen, Hjalmar and Rosen, Ruth Alice (Hudson)","The validity of ""undecided"" answers in questionnaire responses",,University of Illinois,1955,University of Illinois bulletin,,,,https://cir.nii.ac.jp/crid/1130000796377205248