@article{15365,
      recid = {15365},
      author = {Piltz, Albert, and Sund, Robert B.,},
      title = {Creative teaching of science in the elementary school},
      publisher = {Allyn and Bacon},
      address = {Boston,},
      pages = {xv, 217 p.},
      year = {1968},
      url = {http://library.usi.edu/record/15365},
}