To cite package ‘promises’ in publications use:

  Cheng J (2024). _promises: Abstractions for Promise-Based
  Asynchronous Programming_. R package version 1.3.1,
  <https://CRAN.R-project.org/package=promises>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {promises: Abstractions for Promise-Based Asynchronous Programming},
    author = {Joe Cheng},
    year = {2024},
    note = {R package version 1.3.1},
    url = {https://CRAN.R-project.org/package=promises},
  }