To cite concstats in publications use:

  Schneider A (2023). “concstats: Market Structure, Concentration and
  Inequality Measures, with R.” _Journal of Open Source Software_,
  *8*(89), 5885. doi:10.21105/joss.05885
  <https://doi.org/10.21105/joss.05885>,
  <https://doi.org/10.21105/joss.05885>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {concstats: Market Structure, Concentration and Inequality Measures, with R},
    author = {Andreas Schneider},
    journal = {Journal of Open Source Software},
    publisher = {The Open Journal},
    year = {2023},
    volume = {8},
    number = {89},
    pages = {5885},
    url = {https://doi.org/10.21105/joss.05885},
    doi = {10.21105/joss.05885},
  }