To cite package ‘metrosp’ in publications use:

  Oike V (2026). _metrosp: São Paulo Metro Passenger Demand Data_. R
  package version 1.0.0, <https://github.com/viniciusoike/metrosp>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {metrosp: São Paulo Metro Passenger Demand Data},
    author = {Vinicius Oike},
    year = {2026},
    note = {R package version 1.0.0},
    url = {https://github.com/viniciusoike/metrosp},
  }