To cite package ‘msgr’ in publications use:

Goymer C (2019). msgr: Extends Messages, Warnings and Errors by Adding Levels and Log Files. R package version 1.1.2, https://CRAN.R-project.org/package=msgr.

Corresponding BibTeX entry:

  @Manual{,
    title = {msgr: Extends Messages, Warnings and Errors by Adding
      Levels and Log Files},
    author = {Chad Goymer},
    year = {2019},
    note = {R package version 1.1.2},
    url = {https://CRAN.R-project.org/package=msgr},
  }