To cite package ‘drat’ in publications use:

  Eddelbuettel D (2023). _drat: 'Drat' R Archive Template_. R package
  version 0.2.4.1, , <https://github.com/eddelbuettel/drat>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {drat: 'Drat' R Archive Template},
    author = {Dirk Eddelbuettel},
    year = {2023},
    note = {R package version 0.2.4.1, 
},
    url = {https://github.com/eddelbuettel/drat},
  }