To cite package ‘GDPuc’ in publications use:

  Koch J (2024). _GDPuc: Easily Convert GDP Data_. R package version
  1.0.5, , <https://github.com/pik-piam/gdpuc>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {GDPuc: Easily Convert GDP Data},
    author = {Johannes Koch},
    year = {2024},
    note = {R package version 1.0.5, 
},
    url = {https://github.com/pik-piam/gdpuc},
  }