To cite GTFSwizard in publications use:

  Quesado Filho, N. O.; Guimaraes, C. G. C.; de Oliveira Neto, F. M.
  (2026). GTFSwizard: Creating, Exploring and Manipulating GTFS Files.
  R package version 1.2.0.
  https://CRAN.R-project.org/package=GTFSwizard.

A BibTeX entry for LaTeX users is

  @Manual{quesado.guimaraes.oliveiraneto.2026,
    title = {GTFSwizard: Creating, Exploring and Manipulating GTFS Files},
    author = {N. O. {Quesado Filho} and C. G. C. Guimaraes and F. M. {de Oliveira Neto}},
    year = {2026},
    note = {R package version 1.2.0},
    url = {https://CRAN.R-project.org/package=GTFSwizard},
    doi = {10.32614/CRAN.package.GTFSwizard},
  }