@article{1489171,
      recid = {1489171},
      author = {Stenros, Jaakko, and Montola, Markus,},
      title = {The rule book : the building blocks of games /},
      pages = {1 online resource.},
      abstract = {"A joyful look at understanding the rules of games, from  Magic The Gathering to ski jumping. The authors discuss  five broad categories of rules: formal rules, internal  rules, social norms, external regulation, and materially  embodied rules"--},
      url = {http://library.usi.edu/record/1489171},
}