@article{192905,
      author = {Sagan, Carl,},
      url = {http://library.usi.edu/record/192905},
      title = {Billions and billions : thoughts on life and death at the  brink of the millennium /},
      publisher = {Random House,},
      recid = {192905},
      pages = {xii, 241 p. :},
      address = {New York :},
      year = {1997},
}