To cite package ‘onetime’ in publications use:

  Hugh-Jones D (2024). _onetime: Run Code Only Once_. R package version
  0.2.0, , <https://github.com/hughjonesd/onetime>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {onetime: Run Code Only Once},
    author = {David Hugh-Jones},
    year = {2024},
    note = {R package version 0.2.0, 
},
    url = {https://github.com/hughjonesd/onetime},
  }