@inproceedings{bird-loper:2004:ACLdemo,
  author    = {Bird, Steven  and  Loper, Edward},
  title     = {NLTK: The Natural Language Toolkit},
  booktitle = {The Companion Volume to the Proceedings of 42st Annual Meeting of the Association for Computational Linguistics},
  editor = {},
  year      = 2004,
  month     = {July},
  address   = {Barcelona, Spain},
  publisher = {Association for Computational Linguistics},
  pages     = {214--217}
}