To cite package ‘blastula’ in publications use:

  Iannone R, Cheng J (2024). _blastula: Easily Send HTML Email
  Messages_. R package version 0.3.5.9000, ,
  <https://github.com/rstudio/blastula>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {blastula: Easily Send HTML Email Messages},
    author = {Richard Iannone and Joe Cheng},
    year = {2024},
    note = {R package version 0.3.5.9000, 
},
    url = {https://github.com/rstudio/blastula},
  }