To cite package ‘plogr’ in publications use:

  Müller K (2018). _plogr: The 'plog' C++ Logging Library_. R package
  version 0.2.0, <https://github.com/krlmlr/plogr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {plogr: The 'plog' C++ Logging Library},
    author = {Kirill Müller},
    year = {2018},
    note = {R package version 0.2.0},
    url = {https://github.com/krlmlr/plogr},
  }