To cite package ‘gtfs2gps’ in publications use:

  Pereira R, Andrade P, Bazzo J (2025). _gtfs2gps: Converting Transport
  Data from GTFS Format to GPS-Like Records_. R package version
  2.1-2.9000, <https://github.com/ipeagit/gtfs2gps>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {gtfs2gps: Converting Transport Data from GTFS Format to GPS-Like Records},
    author = {Rafael H. M. Pereira and Pedro R. Andrade and Joao Bazzo},
    year = {2025},
    note = {R package version 2.1-2.9000},
    url = {https://github.com/ipeagit/gtfs2gps},
  }