To cite package ‘cropcircles’ in publications use:

Oehm D (2023). cropcircles: Crops an Image to a Circle. R package version 0.2.4, https://github.com/doehm/cropcircles.

Corresponding BibTeX entry:

  @Manual{,
    title = {cropcircles: Crops an Image to a Circle},
    author = {Daniel Oehm},
    year = {2023},
    note = {R package version 0.2.4},
    url = {https://github.com/doehm/cropcircles},
  }