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
"Heltveit, Trygve",Differentiating and unifying tendencies in the ablaut system of strong verbs in English,,J. Grundt Tanum,1949,Skrifter fra det germanistiske seminar ved Universitetet i Oslo,,,,https://cir.nii.ac.jp/crid/1130000797533725056