@article{324296,
      author = {Ness, Daniel, and Farenga, Stephen J.,},
      url = {http://library.usi.edu/record/324296},
      title = {Knowledge under construction : the importance of play in  developing children's spatial and geometric thinking /},
      publisher = {Rowman & Littlefield,},
      recid = {324296},
      pages = {xxiii, 257 p. :},
      address = {Lanham, Md. :},
      year = {2007},
}