To cite surveydown in publications use:

  Helveston J, Hu P, Bunea B (2024). _surveydown: Markdown-Based
  Surveys Using Quarto And Shiny_. R package,
  <https://surveydown.org/>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {surveydown: Markdown-Based Surveys Using Quarto And Shiny},
    author = {John Paul Helveston and Pingfan Hu and Bogdan Bunea},
    year = {2024},
    note = {R package},
    url = {https://surveydown.org/},
  }