To cite interplot in publications use:

Frederick Solt and Yue Hu (2015). interplot: Plot the Effects of Variables in Interaction Terms. available at The Comprehensive R Archive Network (CRAN). URL http://CRAN.R-project.org/package=interplot.

Corresponding BibTeX entry:

  @Misc{,
    title = {{interplot}: Plot the Effects of Variables in Interaction
      Terms},
    author = {Frederick Solt and Yue Hu},
    howpublished = {Available at The Comprehensive R Archive Network
      (CRAN)},
    year = {2015},
    url = {http://CRAN.R-project.org/package=interplot},
  }