To cite crfsuite in publications use:

Wijffels, J. and Okazaki, N. (2018) Conditional Random Fields for Labelling Sequential Data in Natural Language Processing based on CRFsuite: a fast implementation of Conditional Random Fields (CRFs) https://github.com/bnosac/crfsuite

Corresponding BibTeX entry:

  @Misc{,
    title = {{crfsuite}: Conditional Random Fields for Labelling
      Sequential Data in Natural Language Processing based on CRFsuite:
      a fast implementation of Conditional Random Fields (CRFs)},
    author = {Jan Wijffels and Naoaki Okazaki},
    year = {2007-2018},
    url = {https://github.com/bnosac/crfsuite},
    organization = {BNOSAC},
    note = {R package version 0.1},
  }