@article{773157,
      author = {Llewellyn, Karl N. and Schauer, Frederick F.},
      url = {http://library.usi.edu/record/773157},
      title = {The theory of rules [electronic resource] /},
      publisher = {University of Chicago Press,},
      recid = {773157},
      pages = {157 p.},
      address = {Chicago :},
      year = {2011},
}