To cite package ‘messaging’ in publications use:

Iannone R (2018). messaging: Conveniently Issue Messages, Warnings, and Errors. R package version 0.1.0, https://github.com/rich-iannone/messaging.

Corresponding BibTeX entry:

  @Manual{,
    title = {messaging: Conveniently Issue Messages, Warnings, and
      Errors},
    author = {Richard Iannone},
    year = {2018},
    note = {R package version 0.1.0},
    url = {https://github.com/rich-iannone/messaging},
  }