To cite package ‘qlcal’ in publications use:

  Eddelbuettel D, QuantLib Authors (2024). _qlcal: R Bindings to the
  Calendaring Functionality of 'QuantLib'_. R package version 0.0.13, ,
  <https://github.com/qlcal/qlcal-r>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {qlcal: R Bindings to the Calendaring Functionality of 'QuantLib'},
    author = {Dirk Eddelbuettel and {QuantLib Authors}},
    year = {2024},
    note = {R package version 0.0.13, 
},
    url = {https://github.com/qlcal/qlcal-r},
  }