@article{442028,
      author = {Powell, Guy R. and Groves, Steven. and Dimos, Jerry.},
      url = {http://library.usi.edu/record/442028},
      title = {ROI of $ocial media: how to improve the return on your  social marketing investment /},
      publisher = {John Wiley & Sons (Asia),},
      recid = {442028},
      pages = {xxv, 289 p. :},
      address = {Singapore :},
      year = {2011},
}