To cite package ‘S7’ in publications use:

  Vaughan D, Hester J, Kalinowski T, Landau W, Lawrence M, Maechler M,
  Tierney L, Wickham H (2024). _S7: An Object Oriented System Meant to
  Become a Successor to S3 and S4_. R package version 0.2.0,
  <https://CRAN.R-project.org/package=S7>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {S7: An Object Oriented System Meant to Become a Successor to S3 and
S4},
    author = {Davis Vaughan and Jim Hester and Tomasz Kalinowski and Will Landau and Michael Lawrence and Martin Maechler and Luke Tierney and Hadley Wickham},
    year = {2024},
    note = {R package version 0.2.0},
    url = {https://CRAN.R-project.org/package=S7},
  }