To cite package ‘ifo’ in publications use:

  Mücke M (2024). _ifo: Client for the Ifo Institute Time Series_. R
  package version 0.2.0, <https://CRAN.R-project.org/package=ifo>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ifo: Client for the Ifo Institute Time Series},
    author = {Maximilian Mücke},
    year = {2024},
    note = {R package version 0.2.0},
    url = {https://CRAN.R-project.org/package=ifo},
  }