@article{852970,
      author = {Beukelman, David R., and Mirenda, Pat, and Ball, Laura  J.,},
      url = {http://library.usi.edu/record/852970},
      title = {Augmentative & alternative communication : supporting  children and adults with complex communication needs /},
      recid = {852970},
      pages = {1 online resource (612 pages) :},
}