Paper  bibtex   

@misc{Astleitner1999,
  author    = {Hermann Astleitner},
  title     = {{Online-Kurs {\"u}ber Kritisches Denken}},
  year      = 1999,
  month     = 10,
  url= {http://is.gd/7qvDcF},
  urldate={2012-07-20},
}