To cite readability in publications, please use:

Rinker, T. W. (2017). readability: Tools to Calculate Readability Scores version 0.1.1. University at Buffalo. Buffalo, New York. http://github.com/trinker/readability

Corresponding BibTeX entry:

  @Manual{,
    title = {{readability}: Tools to Calculate Readability Scores},
    author = {Tyler W. Rinker},
    organization = {University at Buffalo/SUNY},
    address = {Buffalo, New York},
    note = {version 0.1.1},
    year = {2017},
    url = {http://github.com/trinker/readability},
  }