@book{
  author = "太田, 達也",
  title = "ドイツ語",
  year: 2018
  month: 8
  key = "ドイツ語",
  publisher = "白水社",
  address = "東京",
  series = "ニューエクスプレスプラス ;",
  ISSN/ISBN = "9784560087879 [4560087873]",
}