To cite package ‘robotstxt’ in publications use:

  Meissner P, Ren K (2024). _robotstxt: A 'robots.txt' Parser and
  'Webbot'/'Spider'/'Crawler' Permissions Checker_. R package version
  0.7.15.9000, , <https://github.com/ropensci/robotstxt>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {robotstxt: A 'robots.txt' Parser and 'Webbot'/'Spider'/'Crawler'
Permissions Checker},
    author = {Peter Meissner and Kun Ren},
    year = {2024},
    note = {R package version 0.7.15.9000, 
},
    url = {https://github.com/ropensci/robotstxt},
  }