To cite package ‘hillshader’ in publications use:

Roudier P (2024). hillshader: Create Hillshade Relief Maps Using Ray-Tracing. R package version 0.1.2, https://github.com/pierreroudier/hillshader.

Corresponding BibTeX entry:

  @Manual{,
    title = {hillshader: Create Hillshade Relief Maps Using
      Ray-Tracing},
    author = {Pierre Roudier},
    year = {2024},
    note = {R package version 0.1.2},
    url = {https://github.com/pierreroudier/hillshader},
  }