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

  Barrett T, Dowle M, Srinivasan A, Gorecki J, Chirico M, Hocking T,
  Schwendinger B, Krylov I (2026). _data.table: Extension of
  `data.frame`_. R package version 1.18.2.1,
  <https://CRAN.R-project.org/package=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 and Ivan Krylov},
    year = {2026},
    note = {R package version 1.18.2.1},
    url = {https://CRAN.R-project.org/package=data.table},
  }