To cite Immutables in publications use:

O'Neil S (2026). Immutables: Fast and Functional Data Structures. doi:10.5281/zenodo.19686096, R package version 1.0.1, https://oneilsh.github.io/immutables/.

Corresponding BibTeX entry:

  @Manual{,
    title = {Immutables: Fast and Functional Data Structures},
    author = {Shawn T. O'Neil},
    year = {2026},
    note = {R package version 1.0.1},
    doi = {10.5281/zenodo.19686096},
    url = {https://oneilsh.github.io/immutables/},
  }