@article{EngeserRheinbergMoeller2009,
  author    = {Stefan Engeser and Falko Rheinberg and Matthias Moeller},
  title     = {Achievement motive imagery in German schoolbooks : a pilot study testing McClelland's hypothesis},
  doi       = {10.1016/j.jrp.2008.12.001},
  url       = {http://www.sciencedirect.com/science/journal/00926566},
  year      = {2009},
}