To cite package ‘spectrakit’ in publications use:

  Pastorelli G (2025). _spectrakit: Spectral Data Handling and
  Visualization_. R package version 0.1.1,
  <https://github.com/gianluca-pastorelli/spectrakit>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {spectrakit: Spectral Data Handling and Visualization},
    author = {Gianluca Pastorelli},
    year = {2025},
    note = {R package version 0.1.1},
    url = {https://github.com/gianluca-pastorelli/spectrakit},
  }