To cite package ‘egg’ in publications use:

Auguie B (2020). egg: Extensions for 'ggplot2': Custom Geom, Custom Themes, Plot Alignment, Labelled Panels, Symmetric Scales, and Fixed Panel Size. R package version 0.4.5, https://github.com/baptiste/egg.

Corresponding BibTeX entry:

  @Manual{,
    title = {egg: Extensions for 'ggplot2': Custom Geom, Custom Themes,
      Plot Alignment, Labelled Panels, Symmetric Scales, and Fixed
      Panel Size},
    author = {Baptiste Auguie},
    year = {2020},
    note = {R package version 0.4.5},
    url = {https://github.com/baptiste/egg},
  }