To cite actuar in publications use:

  Dutang C, Goulet V, Pigeon M (2008). “actuar: An R Package for
  Actuarial Science.” _Journal of Statistical Software_, *25*(7), 1-37.
  doi:10.18637/jss.v025.i07 <https://doi.org/10.18637/jss.v025.i07>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {actuar: An {R} Package for Actuarial Science},
    author = {Christophe Dutang and Vincent Goulet and Mathieu Pigeon},
    journal = {Journal of Statistical Software},
    year = {2008},
    volume = {25},
    number = {7},
    pages = {1--37},
    doi = {10.18637/jss.v025.i07},
  }

For the implementation of the Feller-Pareto family of distributions,
use:

  Dutang C, Goulet V, Langevin N (2022). “Feller-Pareto and Related
  Distributions: Numerical Implementation and Actuarial Applications.”
  _Journal of Statistical Software_, *103*(6), 1-22.
  doi:10.18637/jss.v103.i06 <https://doi.org/10.18637/jss.v103.i06>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{F}eller-{P}areto and Related Distributions: Numerical Implementation and Actuarial Applications},
    author = {Christophe Dutang and Vincent Goulet and Nicholas Langevin},
    journal = {Journal of Statistical Software},
    year = {2022},
    volume = {103},
    number = {6},
    pages = {1--22},
    doi = {10.18637/jss.v103.i06},
  }