To cite package ‘card’ in publications use:

  Shah A (2024). _card: Cardiovascular Applications in Research Data_.
  R package version 0.1.1, <https://CRAN.R-project.org/package=card>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {card: Cardiovascular Applications in Research Data},
    author = {Anish S. Shah},
    year = {2024},
    note = {R package version 0.1.1},
    url = {https://CRAN.R-project.org/package=card},
  }