To cite package ‘covid19br’ in publications use:

  Demarqui FN, Santos CC, Costa MB (2022). _covid19br: Brazilian
  COVID-19 Pandemic Data_. R package version 0.1.4,
  <https://CRAN.R-project.org/package=covid19br>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {covid19br: Brazilian COVID-19 Pandemic Data},
    author = {Fábio N. Demarqui and Cristiano C. Santos and Matheus B. Costa},
    year = {2022},
    note = {R package version 0.1.4},
    url = {https://CRAN.R-project.org/package=covid19br},
  }