To cite package ‘rdflib’ in publications use:

  Carl Boettiger. (2018). rdflib: A high level wrapper around the
  redland package for common rdf applications (Version 0.1.0). Zenodo.
  <https://doi.org/10.5281/zenodo.1098478>

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rdflib: A high level wrapper around the redland package for common rdf applications},
    author = {Carl Boettiger},
    role = {aut cre cph},
    comment = {0000-0002-1642-628X},
    year = {2018},
    publisher = {Zenodo},
    doi = {10.5281/zenodo.1098478},
    url = {https://doi.org/10.5281/zenodo.1098478},
  }