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 "Versloot, Arjen P.",Mechanisms of language change : vowel reduction in 15th century West Frisian,,LOT,2008,LOT,,9789078328698,,https://cir.nii.ac.jp/crid/1130000798037579136