To cite package ‘spAddins’ in publications use:

Gegzna V (2020). spAddins: RStudio Add-ins to Format R Markdown files (RETIRED PACKAGE). R package version 0.2.3, https://github.com/gegznav/spaddins.

Corresponding BibTeX entry:

  @Manual{,
    title = {spAddins: RStudio Add-ins to Format R Markdown files
      (RETIRED PACKAGE)},
    author = {Vilmantas Gegzna},
    year = {2020},
    note = {R package version 0.2.3},
    url = {https://github.com/gegznav/spaddins},
  }