@book{ BA87660498,
  author    = "佐藤, 俊樹 ",
  title     = "意味とシステム : ルーマンをめぐる理論社会学的探究",
  publisher = "勁草書房",
  year      = "2008",
  URL       = "https://ci.nii.ac.jp/ncid/BA87660498"
}