To cite package ‘constants’ in publications use:

Ucar I (2025). constants: Reference on Constants, Units and Uncertainty. R package version 2022.0, https://github.com/r-quantities/constants.

Corresponding BibTeX entry:

  @Manual{,
    title = {constants: Reference on Constants, Units and Uncertainty},
    author = {Iñaki Ucar},
    year = {2025},
    note = {R package version 2022.0},
    url = {https://github.com/r-quantities/constants},
  }