To cite package ‘showimage’ in publications use:

  Csárdi G (2024). _showimage: Show an Image on an 'R' Graphics
  Device_. R package version 1.0.0, ,
  <https://github.com/r-lib/showimage>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {showimage: Show an Image on an 'R' Graphics Device},
    author = {Gábor Csárdi},
    year = {2024},
    note = {R package version 1.0.0, 
},
    url = {https://github.com/r-lib/showimage},
  }