@article{1389725,
      recid = {1389725},
      author = {Engerman, Stanley L.},
      title = {Terms of labor : slavery, serfdom, and free labor /},
      publisher = {Stanford University Press,},
      address = {Stanford, Calif. :},
      pages = {vi, 350 pages ;},
      year = {1999},
      url = {http://library.usi.edu/record/1389725},
}