@article{334190,
      author = {Clark, Ruth Colvin. and Mayer, Richard E.,},
      url = {http://library.usi.edu/record/334190},
      title = {E-learning and the science of instruction : proven  guidelines for consumers and designers of multimedia  learning /},
      publisher = {Pfeiffer,},
      recid = {334190},
      pages = {xvi, 476 p. :},
      address = {San Francisco, CA :},
      year = {2008},
}