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
"Vries, Oebele",Het Heilige Roomse Rijk en de Friese vrijheid,,De Tille,1986,Fryske Akademy,,9065530665,,https://cir.nii.ac.jp/crid/1130000797776752640