@book{
  author = "清野, 智昭(1964-)",
  title = "中級ドイツ語のしくみ",
  year: 2008
  month: 9
  key = "ドイツ語",
  key = "ドイツ語--文法",
  publisher = "白水社",
  address = "東京",
  ISSN/ISBN = "9784560066539 [4560066531]",
}