To cite package ‘GTFShift’ in publications use:

  Matos GF, Félix R (2026). _GTFShift: Explore and Analyse General
  Transit Feed Specification (GTFS) Files with a Focus on Urban
  Mobility_. R package version 1.1.0,
  <https://github.com/u-shift/gtfshift>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {GTFShift: Explore and Analyse General Transit Feed Specification (GTFS)
Files with a Focus on Urban Mobility},
    author = {Gonçalo F. Matos and Rosa Félix},
    year = {2026},
    note = {R package version 1.1.0},
    url = {https://github.com/u-shift/gtfshift},
  }