To cite the 'sn' package in publications, use:

Azzalini, A. (2021). The R package 'sn': The Skew-Normal and Related Distributions such as the Skew-t and the SUN (version 2.0.1). URL http://azzalini.stat.unipd.it/SN/,https://cran.r-project.org/package=sn

Corresponding BibTeX entry:

  @Manual{,
    title = {The {R} package \texttt{sn}: The skew-normal and related
      distributions such as the skew-$t$ and the {SUN} (version
      2.0.1).},
    author = {A. Azzalini},
    address = {Universit\`a degli Studi di Padova, Italia},
    year = {2021},
    note = {Home page: \url{http://azzalini.stat.unipd.it/SN/}},
    url = {https://cran.r-project.org/package=sn},
  }