To cite evgam in publications use:

  Youngman BD (2022). “evgam: An R Package for Generalized Additive
  Extreme Value Models.” _Journal of Statistical Software_, *103*(3),
  1-26. doi:10.18637/jss.v103.i03
  <https://doi.org/10.18637/jss.v103.i03>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{evgam}: An {R} Package for Generalized Additive Extreme Value Models},
    author = {Benjamin D. Youngman},
    journal = {Journal of Statistical Software},
    year = {2022},
    volume = {103},
    number = {3},
    pages = {1--26},
    doi = {10.18637/jss.v103.i03},
  }