To cite congressbr in publications use:

McDonnell RM, Duarte GJ, Freire D, Trecenti J (2017). “congressbr: An R Package for Analysing Data from Brazil's Chamber of Deputies and Federal Senate.” SocArXiv, 1–11. https://osf.io/n5jd8.

Corresponding BibTeX entry:

  @Article{,
    title = {{congressbr}: An R Package for Analysing Data from
      Brazil's Chamber of Deputies and Federal Senate},
    author = {Robert Myles McDonnell and Guilherme Jardim Duarte and
      Danilo Freire and Julio Trecenti},
    journal = {SocArXiv},
    year = {2017},
    pages = {1--11},
    url = {https://osf.io/n5jd8},
  }