To cite package ‘reconstructKM’ in publications use:

  Sun R (2020). _reconstructKM: Reconstruct Individual-Level Data from
  Published KM Plots_. R package version 0.3.0,
  <https://CRAN.R-project.org/package=reconstructKM>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {reconstructKM: Reconstruct Individual-Level Data from Published KM Plots},
    author = {Ryan Sun},
    year = {2020},
    note = {R package version 0.3.0},
    url = {https://CRAN.R-project.org/package=reconstructKM},
  }