To cite package ‘riingo’ in publications use:

  Vaughan D, Dancho M (2024). _riingo: An R Interface to the 'Tiingo'
  Stock Price API_. R package version 0.3.1.9000,
  <https://github.com/business-science/riingo>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {riingo: An R Interface to the 'Tiingo' Stock Price API},
    author = {Davis Vaughan and Matt Dancho},
    year = {2024},
    note = {R package version 0.3.1.9000},
    url = {https://github.com/business-science/riingo},
  }