To cite package ‘hf’ in publications use:

  Tolentino Jr. J (2026). _hf: Head Loss Calculations for Pipelines_. R
  package version 0.0.0.9000, <https://github.com/joaobtj/hf>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {hf: Head Loss Calculations for Pipelines},
    author = {Joao Batista {Tolentino Jr.}},
    year = {2026},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/joaobtj/hf},
  }