To cite package ‘fastmap’ in publications use:

  Chang W (2024). _fastmap: Fast Data Structures_. R package version
  1.2.0, , <https://github.com/r-lib/fastmap>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fastmap: Fast Data Structures},
    author = {Winston Chang},
    year = {2024},
    note = {R package version 1.2.0, },
    url = {https://github.com/r-lib/fastmap},
  }