To cite package ‘ismev’ in publications use:

  Heffernan J (2025). _ismev: An Introduction to Statistical Modeling
  of Extreme Values_. R package version 1.43,
  <https://CRAN.R-project.org/package=ismev>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ismev: An Introduction to Statistical Modeling of Extreme Values},
    author = {Janet E. Heffernan},
    year = {2025},
    note = {R package version 1.43},
    url = {https://CRAN.R-project.org/package=ismev},
  }