@article{192272,
      author = {Verduin, John R. and Clark, Thomas A.,},
      url = {http://library.usi.edu/record/192272},
      title = {Distance education : the foundations of effective practice  /},
      publisher = {Jossey-Bass,},
      recid = {192272},
      pages = {xvi, 279 p. :},
      address = {San Francisco :},
      year = {1991},
}