@inproceedings{von-ahn-2012-duolingo,
    title = "{D}uolingo: Learn a Language for Free while Helping to Translate the Web",
    author = "von Ahn, Luis",
    editor = "Lavie, Alon  and
      Foster, George  and
      Dillinger, Mike  and
      Flournoy, Ray  and
      Bemish, Nick  and
      Simmons, Chuck",
    booktitle = "Proceedings of the 10th Conference of the Association for Machine Translation in the Americas: Keynote Presentations",
    month = oct # " 28-" # nov # " 1",
    year = "2012",
    address = "San Diego, California, USA",
    publisher = "Association for Machine Translation in the Americas",
    url = "https://preview.aclanthology.org/landing_page/2012.amta-keynotes.4/"
}