To cite package ‘fcl’ in publications use:

  Tan X (2024). _fcl: A Financial Calculator_. R package version 0.1.2,
  , <https://github.com/shrektan/fcl>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fcl: A Financial Calculator},
    author = {Xianying Tan},
    year = {2024},
    note = {R package version 0.1.2, },
    url = {https://github.com/shrektan/fcl},
  }