To cite package ‘ggpage’ in publications use:

Hvitfeldt E (2019). ggpage: Creates Page Layout Visualizations. R package version 0.2.3.9000, https://github.com/emilhvitfeldt/ggpage.

Corresponding BibTeX entry:

  @Manual{,
    title = {ggpage: Creates Page Layout Visualizations},
    author = {Emil Hvitfeldt},
    year = {2019},
    note = {R package version 0.2.3.9000},
    url = {https://github.com/emilhvitfeldt/ggpage},
  }