To cite package ‘ukc19’ in publications use:

  Challen R (2025). _ukc19: Datasets from the UK COVID-19 outbreak_. R
  package version 0.0.3, <https://github.com/ai4ci/ukc19>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ukc19: Datasets from the UK COVID-19 outbreak},
    author = {Robert Challen},
    year = {2025},
    note = {R package version 0.0.3},
    url = {https://github.com/ai4ci/ukc19},
  }