To cite package ‘crstools’ in publications use:

  Manica A, Pozzi A, Padilla-Iglesias C, Carter E, Leonardi M, Fatima
  A, Pelanek O, Stephenson N, Colucci M, Jud D, Gunasekaram C (2026).
  _crstools: Tools to Work with Projections_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=crstools>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {crstools: Tools to Work with Projections},
    author = {Andrea Manica and Andrea Pozzi and Cecilia Padilla-Iglesias and Evie Carter and Michela Leonardi and Aramish Fatima and Ondrej Pelanek and Nile Stephenson and Margherita Colucci and Dominik C Jud and Cassandra Gunasekaram},
    year = {2026},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=crstools},
  }