@article{58466,
      recid = {58466},
      author = {Van Engen, Henry. and Hartung, Maurice L. and Stochl,  James E.,},
      title = {Foundations of elementary school arithmetic},
      publisher = {Scott, Foresman},
      address = {Chicago,},
      pages = {xiii, 450 p.},
      year = {1965},
      url = {http://library.usi.edu/record/58466},
}