@book{
  author = "西口, 光一",
  title = "イーさんと日本の友だち",
  year: 2007
  month: 5
  key = "日本語教育(対外国人)",
  publisher = "スリーエーネットワーク",
  address = "東京",
  series = "例文で学ぶ漢字と言葉 / 西口光一著 ; 3級編",
  ISSN/ISBN = "9784883194384 [4883194388]",
}