To cite package ‘CMatching’ in publications use:

  Cannas M (2025). _CMatching: Matching Algorithms for Causal Inference
  with Clustered Data_. R package version 2.4,
  <https://CRAN.R-project.org/package=CMatching>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {CMatching: Matching Algorithms for Causal Inference with Clustered Data},
    author = {Massimo Cannas},
    year = {2025},
    note = {R package version 2.4},
    url = {https://CRAN.R-project.org/package=CMatching},
  }