To cite package ‘quarks’ in publications use:

  Letmathe S (2026). _quarks: Simple Methods for Calculating and
  Backtesting Value at Risk and Expected Shortfall_. R package version
  1.1.6, <https://github.com/letmode/quarks>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {quarks: Simple Methods for Calculating and Backtesting Value at Risk and
Expected Shortfall},
    author = {Sebastian Letmathe},
    year = {2026},
    note = {R package version 1.1.6},
    url = {https://github.com/letmode/quarks},
  }