To cite ggpie in publications use:
Song Y (2022). ggpie: Create Pie, Donut and Rose Pie Plot with 'ggplot2'.. R package version 0.2.2, https://CRAN.R-project.org/package=ggpie.
Corresponding BibTeX entry:
@Manual{,
title = {ggpie: Create Pie, Donut and Rose Pie Plot with
'ggplot2'.},
author = {Yabing Song},
note = {R package version 0.2.2},
year = {2022},
url = {https://CRAN.R-project.org/package=ggpie},
}