@inproceedings{loper-bird:2002:TNLP,
  author    = {Loper, Edward  and  Bird, Steven},
  title     = {NLTK: The Natural Language Toolkit},
  booktitle = {Proceedings of the Workshop on Effective Tools and Methodologies for Teaching Natural Language Processing and Computational Linguistics},
  year      = 2002,
  month     = {July},
  address   = {Philadelphia},
  publisher = {Association for Computational Linguistics},
  pages     = {63--70}
}