To cite package ‘fpc’ in publications use:

  Hennig C (2026). _fpc: Flexible Procedures for Clustering_. R package
  version 2.2-15, <https://CRAN.R-project.org/package=fpc>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fpc: Flexible Procedures for Clustering},
    author = {Christian Hennig},
    year = {2026},
    note = {R package version 2.2-15},
    url = {https://CRAN.R-project.org/package=fpc},
  }
