To cite package ‘cargo’ in publications use:

  David B. Dahl (2021), Writing R Extensions in Rust, arXiv:2108.07179
  [cs.PL], URL https://arxiv.org/abs/2108.07179.

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {Writing R Extensions in Rust},
    author = {David B. Dahl},
    year = {2021},
    eprint = {2108.07179},
    archiveprefix = {arXiv},
    primaryclass = {cs.PL},
  }