To cite package ‘data.table’ in publications use:

  Barrett T, Dowle M, Srinivasan A, Gorecki J, Chirico M, Hocking T,
  Schwendinger B (2024). _data.table: Extension of `data.frame`_. R
  package version 1.16.99, ,
  <https://github.com/rdatatable/data.table>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {data.table: Extension of `data.frame`},
    author = {Tyson Barrett and Matt Dowle and Arun Srinivasan and Jan Gorecki and Michael Chirico and Toby Hocking and Benjamin Schwendinger},
    year = {2024},
    note = {R package version 1.16.99, },
    url = {https://github.com/rdatatable/data.table},
  }