To cite package ‘flashr’ in publications use:

  Stevens J (2024). _flashr: Create Flashcards of Terms and
  Definitions_. R package version 0.2.0,
  <https://CRAN.R-project.org/package=flashr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {flashr: Create Flashcards of Terms and Definitions},
    author = {Jeffrey R. Stevens},
    year = {2024},
    note = {R package version 0.2.0},
    url = {https://CRAN.R-project.org/package=flashr},
  }