@article{475160,
      author = {Gelman, Rochel. and Gallistel, C. R.,},
      url = {http://library.usi.edu/record/475160},
      title = {The child's understanding of number [electronic resource]  /},
      publisher = {Harvard University Press,},
      recid = {475160},
      pages = {xiii, 260 p. :},
      address = {Cambridge, MA :},
      year = {1978},
}