@book{ BA21483132,
  author    = "Fogel, Robert William and Galantine, Ralph A. and Manning, Richard L. and Cardell, Nicholas Scott",
  title     = "Without consent or contract : the rise and fall of American slavery : evidence and methods",
  publisher = "London : W.W. Norton",
  year      = "1992",
  edition   = "1st ed",
  URL       = "https://ci.nii.ac.jp/ncid/BA21483132"
}