@article{93958,
      author = {Henry, Nelson B.},
      url = {http://library.usi.edu/record/93958},
      title = {Audio-visual materials of instruction;},
      publisher = {Univ. of Chicago Press,},
      recid = {93958},
      pages = {x, 320 p.},
      address = {Chicago,},
      year = {1949},
}