@book{ BA23332003,
  author    = "Harding, Walter Roy",
  title     = "Henry David Thoreau : a profile",
  publisher = "Hill and Wang",
  year      = "1971",
  edition   = "[1st ed.]",
  series    = "American profiles",
  number    = "",
  URL       = "https://ci.nii.ac.jp/ncid/BA23332003"
}