@article{250731,
      author = {Helm, Judy Harris. and Katz, Lilian G.},
      url = {http://library.usi.edu/record/250731},
      title = {Young investigators : the project approach in the early  years /},
      publisher = {Teachers College Press,},
      recid = {250731},
      pages = {1 v. (various pagings) :},
      address = {New York :},
      year = {2001},
}