To cite package ‘femtograd’ in publications use:

  Towell A (2026). _femtograd: Automatic Differentiation for
  Statistical Computing_. R package version 0.3.1,
  <https://github.com/queelius/femtograd>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {femtograd: Automatic Differentiation for Statistical Computing},
    author = {Alexander Towell},
    year = {2026},
    note = {R package version 0.3.1},
    url = {https://github.com/queelius/femtograd},
  }