@article{58138,
      note = {Published in 1952 under title: Building mathematical  concepts in the elementary school.},
      author = {Spencer, Peter Lincoln, and Brydegaard, Marguerite,},
      url = {http://library.usi.edu/record/58138},
      title = {Building mathematical competence in the elementary school},
      publisher = {Holt, Rinehart and Winston},
      recid = {58138},
      pages = {xii, 403 p.},
      address = {New York,},
      year = {1966},
}