@InProceedings{nltk_acl02,
  author =       {Edward Loper and Steven Bird},
  title =        {NLTK: The Natural Language Toolkit},
  booktitle =    {Proceedings of the ACL Workshop on Effective Tools
                  and Methodologies for Teaching Natural Language
                  Processing and Computational Linguistics},
  pages =        {62-69},
  year =         2002,
  address =      {Philadelphia},
  month =        {July}
}