To cite the 'patternplot' package in publications use:

Luo C, Bai S (2019). Versatile Pie Charts, Ring Charts, Bar Charts and Box Plots using Patterns, Colors and Images. R package version 0.3.2.

Corresponding BibTeX entry:

  @Manual{,
    title = {Versatile Pie Charts, Ring Charts, Bar Charts and Box
      Plots using Patterns, Colors and Images},
    author = {Chunqiao Luo and Shasha Bai},
    year = {2019},
    note = {R package version 0.3.2},
  }