To cite package ‘fastLink’ in publications use:

  Enamorado T, Fifield B, Imai K (2023). _fastLink: Fast Probabilistic
  Record Linkage with Missing Data_. R package version 0.6.1,
  <https://CRAN.R-project.org/package=fastLink>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fastLink: Fast Probabilistic Record Linkage with Missing Data},
    author = {Ted Enamorado and Ben Fifield and Kosuke Imai},
    year = {2023},
    note = {R package version 0.6.1},
    url = {https://CRAN.R-project.org/package=fastLink},
  }