To cite package ‘checkarg’ in publications use:

Van Walle I (2018). checkarg: Check the Basic Validity of a (Function) Argument. R package version 0.2.0, https://github.com/ivwalle/checkarg.

Corresponding BibTeX entry:

  @Manual{,
    title = {checkarg: Check the Basic Validity of a (Function)
      Argument},
    author = {Ivo {Van Walle}},
    year = {2018},
    note = {R package version 0.2.0},
    url = {https://github.com/ivwalle/checkarg},
  }