Paper  bibtex   

@article{ osguthorpe_blended_2003,
  title = {Blended {Learning} {Environments}: {Definitions} and {Directions}.},
  volume = {4},
  shorttitle = {Blended {Learning} {Environments}},
  url = {http://eric.ed.gov/ERICWebPortal/recordDetail?accno=EJ678078},
  number = {3},
  urldate = {2012-06-29TZ},
  journal = {Quarterly Review of Distance Education},
  author = {Osguthorpe, R. T and Graham, C. R},
  year = {2003},
  pages = {227--33}
}