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 2.0.0). URL http://azzalini.stat.unipd.it/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 2.0.0).},
    author = {A. Azzalini},
    address = {Universit\`a di Padova, Italia},
    year = {2021},
    url = {http://azzalini.stat.unipd.it/SN/},
  }