To cite mplot in publications use:

Samuel Mueller GAW (2014). mplot: Graphical model stability and model selection procedures. https://github.com/garthtarr/mplot.

Corresponding BibTeX entry:

  @Manual{,
    title = {mplot: Graphical model stability and model selection
      procedures},
    author = {Garth Tarr Alan Welsh {Samuel Mueller}},
    year = {2014},
    url = {https://github.com/garthtarr/mplot},
  }