@book{ BN07014993,
  author    = "労働省労働基準局賃金時間部労働時間課",
  title     = "労働時間白書 : 労働時間短縮の現状と課題",
  publisher = "日本労働研究機構",
  year      = "1991",
  URL       = "https://ci.nii.ac.jp/ncid/BN07014993"
}