To cite package ‘smdata’ in publications use:

  Merkle E (2026). _smdata: Data to Accompany Smithson & Merkle, 2013_.
  R package version 1.3, <https://CRAN.R-project.org/package=smdata>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {smdata: Data to Accompany Smithson & Merkle, 2013},
    author = {Edgar Merkle},
    year = {2026},
    note = {R package version 1.3},
    url = {https://CRAN.R-project.org/package=smdata},
  }