To cite package ‘nabla’ in publications use:

  Towell A (2026). _nabla: Exact Derivatives via Automatic
  Differentiation_. R package version 0.7.1,
  <https://github.com/queelius/nabla>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nabla: Exact Derivatives via Automatic Differentiation},
    author = {Alexander Towell},
    year = {2026},
    note = {R package version 0.7.1},
    url = {https://github.com/queelius/nabla},
  }